Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a2fa15439aaa28…

MALICIOUS

PDF

58.3 KB Created: 2020-08-13 04:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0ca649016fffb9a2c5170ffa700625 SHA-1: 31b1ef0ab7c29c55a773519a6a391d74d4c2d11b SHA-256: 61a2fa15439aaa287ba247ccdb55e0ec7c8fe20d4a6128057a24a077e171035f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/wb?keyword=sibutramina%20bula%20pdf, which is flagged as a malicious redirector. The document's structure and content suggest it is designed to lead users to potentially harmful websites, likely for phishing or malware distribution.

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/wb?keyword=sibutramina%20bula%20pdf
    • http://files.scorefishingusa.com/uploads/1/3/2/7/132710797/mesujijawox.pdf
    • http://files.viewfindercoaching.com/uploads/1/3/0/8/130874162/2317519.pdf
    • http://files.4elements1.com/uploads/1/3/0/8/130814492/wovugifinufako-bejoxubuneb-fuxibivut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/sepasavujefuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/30234421303.pdf
    • https://cdn.shopify.com/s/files/1/0438/6547/3189/files/public_relations_officer_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/48831731410.pdf
    • https://cdn.shopify.com/s/files/1/0448/2210/2173/files/chaim_potok_my_name_is_asher_lev.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/bank_audit_checklist_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/prentice_hall_literature.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/90013563830.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/bolerakopipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7312/6052/files/navukexotigenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/ajax_request_response.pdf
    • https://cdn.shopify.com/s/files/1/0435/7138/0383/files/vogojilafutefizu.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6868/files/41474012617.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/tupevojuw.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_off0000a41c.bin
00d1997fa4912a6ab1204192aba753e6a764256afabf13900a20422d9734d90f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA41C 5252 bytes
font_01_sfnt_off0000b5d9.bin
a4f4bcbe2fb15cb534423195db30a901e6c9c5d0956fa36d9fd545ec636a258b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D9 11468 bytes

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