Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ee435c1427b447…

MALICIOUS

PDF

45.9 KB Created: 2020-10-16 09:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 38366dc0173b2b554c66330361a7d5d0 SHA-1: 984af003a1783ab80e5fe306c0deced30b8b6f17 SHA-256: b6ee435c1427b44780080db119e0c029203ea2d2ee153c082411d5ea36c37b25
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or SEO link farms, indicating a malicious intent to distribute content. The presence of a link to 'cctraff.ru' with a keyword related to game downloads suggests a lure for potentially unwanted or malicious software. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest it's designed to redirect users to malicious sites.

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://cctraff.ru/strik?keyword=old+school+runescape+mobile+apk+ios In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f88c3fe5e1dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8911fc1b076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8838a6cf66a.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/musub_noxevatug.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/jutile_wunanefoxulij.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/13b897d65df.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/756402.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/wodabaxazugiwafab.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/1/0497/2688/1972/files/grams_to_dwt_gold.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0243/6245/files/plum_creek_academy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/97503906179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1889/7573/files/3459554542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6991/3753/files/48188252141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/asus_am3_motherboard_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5600/3744/files/specific_heat_and_climate_lab_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9536/8876/files/gastrite_nervosa_tratamento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/pt_schools_that_accept_low_gpas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9827/8555/files/xopirusoxerelixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/punesunevepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/ribenetifolow.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_off00007323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7323 5544 bytes
SHA-256: cf51766563d345dc34ca762745a5b04f96625ed092adf0f9239a6c52edbf6596
font_01_sfnt_off000085c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C1 10656 bytes
SHA-256: 4d152eba95631eb622e54ca6d954a3f6f80328324a5bbac28507827adce303ef

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