Malicious PDF — malware analysis report

Static analysis result for SHA-256 31856a7e124a9245…

MALICIOUS

PDF

38.4 KB Created: 2020-08-22 04:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7180779dcfc30af30a14c4099ca01e SHA-1: 1445d7d16f48cf14bb8b30edaf075989f81fe219 SHA-256: 31856a7e124a9245c81995dd8e93ec759cd771976cc0af1f462982396832c9d0
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a resource for factoring binomials. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering through a deceptive document title and a malicious link.

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=factoring+binomials+questions+and+answers
    • http://sudunesa.thequestofjz.com/uploads/1/3/0/8/130814229/koninoxawibipop_bakukarelema_sukadawilex_bipadozebozoga.pdf
    • http://goleji.annawitte.org/uploads/1/3/0/7/130776367/48aa61.pdf
    • http://bavik.oldplunderuk.com/uploads/1/3/1/4/131437532/93529.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
    • https://cdn.shopify.com/s/files/1/0435/9127/0563/files/2019_calendar_template_c_calendarlabs._com.pdf
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/kexegujof.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5760/files/remalelifofometupidup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/fipiwibapokenititakeze.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/how_to_code_a_game_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/napasexafuxevozijaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/64599988090.pdf
    • https://cdn.shopify.com/s/files/1/0430/8480/8346/files/karl_storz_c-_mac_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/77602527236.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/agilent_34970a_manual.pdf
    • https://cdn.shopify.com/s/files/1/0449/4281/9496/files/quant_job_interview_questions_and_answers_second_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/99815253292.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ee0.bin
50251fa40ca44a036548abea2489951723a9a66dab4a505a4e5fc00d9f456658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE0 5572 bytes
font_01_sfnt_off000061bc.bin
f536693b6c7fff81fda0982cc37f463d572095258d8a575762a3f68ce00b8846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 13608 bytes

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