Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c5c4eccabb7f27…

MALICIOUS

PDF

45.2 KB Created: 2020-10-25 21:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dbefd8d03d2a62265b64e58d742f90b7 SHA-1: 93fa3954cd421f4450cbc78e89ba9e3aa9e574c0 SHA-256: d6c5c4eccabb7f27748859e58985ad85e48c4bf870a59ff105779ef57369d77a
170 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links, one of which, 'https://ttraff.ru/123?keyword=color+game+apk+cheat', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for a 'color game apk cheat'. The presence of numerous external links, many pointing to benign content, suggests a link farm used to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/123?keyword=color+game+apk+cheat In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4024f04-b534-4223-a08c-92a9f62ddf5b/ralph_lauren_bedding_outlet_discontinued.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4baec73-3d3a-4e47-934a-5da34c4d727d/32097534094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8d5957-2c3c-47ae-af96-9f993410af29/98285418433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a740b121-1837-4d01-979f-4d409e11260a/morat_na_predaj_v_hertfordshire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/34091522446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/grade_6_comprehensive_curriculum_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7973/8544/files/top_10_android_mobile_games_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/goodyear_assurance_fuel_max_215_55r17.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/northridge_pacific_theaters_northridge_ca_91324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6321/1701/files/diwove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/52040966069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/rutawaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c139ea12-6132-4a80-abd2-3ebc5a66a87d/92391681137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f5327b-c23d-43ea-b83d-059f7807fc0b/46468760252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5160c7aa-9481-4f96-b2a2-bdf26ac371b8/buwulezaguva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55d5eed-4cea-4b18-9bdf-c3df4891d27e/21280061896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a886e1-802e-432c-85ad-c66576e3f739/94865435741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec54327-2a8a-48cd-b106-0ce20d251f3f/felijabofopofut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41173e29-9b1e-4a20-b12f-edbc3ad18d0a/greatest_manifestation_principle_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7919c138-e93d-452a-92fb-1b1e88fcaf0d/rogero_3.55_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E36 5140 bytes
SHA-256: 8ad58007cc9ecf0d61c1138add0ab3285bd62ab13ef9eb21c1fb646828b49c28
font_01_sfnt_off00007f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8C 12028 bytes
SHA-256: a596afef470adc848659e132281b70355efd9226ddd2723f60739c9190ddc0eb

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