Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3090c0d6e62a108…

MALICIOUS

PDF

53.4 KB Created: 2020-08-21 21:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32694df69958d5936085b8e65dcca182 SHA-1: 12e0d67fd3f99a2fb4d6c556caee2cbf472c9675 SHA-256: a3090c0d6e62a108f7cee33129ec2b6c873f72382309c5e2b04117350fc80977
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=adverbs+of+time+worksheet+grade+5', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious destination or improve SEO for the malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://ttraff.ru/pify?keyword=adverbs+of+time+worksheet+grade+5
    • http://joser.alzubilaw.com/uploads/1/3/1/0/131070317/bupavutirodufud.pdf
    • https://cdn.shopify.com/s/files/1/0439/4047/9144/files/xeratesikixulemu.pdf
    • https://cdn.shopify.com/s/files/1/0453/5566/3515/files/fundamentals_of_electrical_and_electronic_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/tinkers_construct_well_established.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/29215407922.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6285/files/32205785211.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/45871030937.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/lodadagibonetud.pdf
    • https://cdn.shopify.com/s/files/1/0434/6223/0181/files/97765000385.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3294478915.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6808/files/excretion_in_annelida_through_nephridia.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/blood_donation_health_check_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/tamil_christian_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/vulofupuvi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008588.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8588 2828 bytes
font_01_sfnt_off00008f82.bin
8c5a37734e466eb4cf38a5e4e2e0ef1b09ca3962c234bcc5267a6cb377721cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F82 5756 bytes
font_02_sfnt_off0000a314.bin
7b42663652bd99b32188295b5c31f659809725a0564e5caff70c58ade3d60865		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA314 11700 bytes

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