Malicious PDF — malware analysis report

Static analysis result for SHA-256 761c03999d3a95cf…

MALICIOUS

PDF

122.9 KB Created: 2020-08-23 23:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32b693c0e1b69f0b7547ca4e0a7a0c0 SHA-1: 5b33e9467a8819ddd3404470c7c08b0f392f4647 SHA-256: 761c03999d3a95cf1c2c73e35ddfde59eab12421a37a66bc5b708f76f14e2426
154 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 Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.com/pify?keyword=media+and+information+literacy+curriculum+guide+shs, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating its central role in the attack. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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.com/pify?keyword=media+and+information+literacy+curriculum+guide+shs
    • http://zapige.traditionalupholsteryschool.co.uk/uploads/1/3/0/9/130969754/6062032.pdf
    • http://files.moonyounglee.org/uploads/1/3/2/8/132815343/nakolisidetonuk.pdf
    • http://files.growingupcatholic.com/uploads/1/3/0/9/130969045/wotegubowisenofixek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/22257681118.pdf
    • https://cdn.shopify.com/s/files/1/0428/6663/9014/files/zivam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7147/files/canal_atrioventricular_comun.pdf
    • https://cdn.shopify.com/s/files/1/0436/1833/6925/files/bes_embroidery_software_3_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/pokemon_colosseum_pokemon_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/celebration_square_events_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/rofesenijajaxexew.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/70598684309.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/modle_d_attestation_de_prise_en_charge_pour_visa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/mozej.pdf
    • https://cdn.shopify.com/s/files/1/0428/7001/4111/files/tojuzawasop.pdf
    • https://cdn.shopify.com/s/files/1/0438/2156/4066/files/daruremanoxima.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/valunax.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019eba.bin
742dc7b2a88f6bde15eef5206a2e391d04787c4379b902a3e465e5456b1f4d5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19EBA 5540 bytes
font_01_sfnt_off0001b174.bin
f3f690593c402348995029ff7e72a7f1e4757406357e94806f74443faed6a6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B174 14144 bytes

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