Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a8971950c44cf0…

MALICIOUS

PDF

32.7 KB Created: 2020-11-04 03:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 79d5f500cc13b5b63a8eb24f293d6f1c SHA-1: de7c0e2dd998a0599d1b6931fcada821912382b1 SHA-256: f0a8971950c44cf016d5a22e88d53c11b2ae4fca08c15f42186c503994bef44d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of a link farm designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/aws?keyword=deviantart+tickle+rp In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f89060028c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fa185a6c76f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5f9203cb73b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f979dc13d29a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6603/1257/files/wosesepurejafejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4fd4a7-3611-446a-96f5-e1c3058c4f27/2jz_engine_with_manual_transmission_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f4f643-7ff5-42eb-b54a-931465130869/pijazepolasanazoropagag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19406cde-7e15-4eb9-9594-803769478084/electrical_quote_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94de06be-68a5-4191-8c99-c15fdd7f97ee/turuzazepotavez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a8fb2f-c5e7-42de-bbc0-b855b7c79173/gipojimifadovekuxid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025d3855-bc8d-46a7-b80e-84673060ced2/kicker_marine_speakers_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ae636d-cb5f-4f06-88f1-55ec00d227b0/standard_catalog_of_smith__wesson_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/kutobufevotek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2156aedb-feda-48e7-80c6-a80fc177b136/lazarillo_de_tormes_tratado_1_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7749b965-25a4-42ce-9e10-a806368e5a5f/wusixikifelonewibawutuz.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_off00004673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4673 4872 bytes
SHA-256: 533c39ce210f95a29d8c5815b245b7e0af99fad975874e64db9ce33d632b7e61
font_01_sfnt_off00005727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5727 9216 bytes
SHA-256: 639f900faa76487bddd78b9fd8d125593a25d2eda2a291d8618d819ddb18fc0e

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