Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a5a71d2eea046d…

MALICIOUS

PDF

47.3 KB Created: 2020-10-30 16:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 62166d55aa9ae4be1215417fda645403 SHA-1: 2dd92b48f220e7be757dbec415b9d115e5dc6ad8 SHA-256: 77a5a71d2eea046d0268ae91581b421f521456b42b62cf59c186f7122f5b4779
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/strik?keyword=carbs+in+jersey+mike%2527s+honey+mustard+wrap+wheat+wrap In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f9094ffcf30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5f96677565b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f915a1d29a38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/100_carols_for_choirs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/dejisalenamagigixewoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7894/6468/files/mililani_high_school_bell_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8511/2513/files/chronicle_magazine_may_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3588/8296/files/dazotativugarugevodavuna.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/wogegixuloleripol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/bully_anniversary_edition_apk_mod_unlimited_money.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/runokosowoluxuxujasikepe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB6 5580 bytes
SHA-256: 03c6dde74340960e4948c51bfd6b7124ec298995166b341b7878521e21bb883d
font_01_sfnt_off000060a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A1 10292 bytes
SHA-256: db05ac3ad353c5457fa6e0d0a766fda13d7598389a8640c4b30c86fbf7b7f371
font_02_sfnt_off00008393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8393 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_03_sfnt_off00009194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9194 9204 bytes
SHA-256: 64dca1282e525076267d7def8b59d2ea37ad21d312cd9b01201fde5b3face076

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