Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b4371e47337cd8…

MALICIOUS

PDF

40.1 KB Created: 2020-10-06 18:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: de99db1ef42b8029eeaa5f0e9f73a514 SHA-1: 29bd9b2793a721d692b1950c06b707edc1b3d727 SHA-256: 29b4371e47337cd8f89cdb41e73535b520a5a005935622308180362b7c445341
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=binary+code+practice+worksheet`. It also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign content on Strikingly and Shopify, but one suspicious URL on `peggymischke.com`. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a 'binary code practice worksheet'. The ML classifier strongly indicates maliciousness.

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=binary+code+practice+worksheet In PDF document text
    • http://files.peggymischke.com/uploads/1/3/2/8/132814301/pujejo_desafakujadini.pdfIn PDF document text
    • https://site-1043381.mozfiles.com/files/1043381/rovenaxumizasal.pdfIn PDF document text
    • https://site-1039350.mozfiles.com/files/1039350/97047448553.pdfIn PDF document text
    • https://site-1036850.mozfiles.com/files/1036850/31314550208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8732597a-56c0-4963-9d72-302eb2d719f8/27972788114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e57b001-a22d-43d9-a353-3d6a3d479379/pojazojemidamebepitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0f59a2-316b-4132-a377-e61faa4c9fef/nulonavituxaxilat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8406986c-217d-4035-bf33-9119740467d5/78649916606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0ae0c3-bef3-4dba-872d-24db85d40491/97986096522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5725/6869/files/vezibekaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1519/8104/files/starts_with_c_ends_with_z.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/3084/7128/files/juxajatebevuraretetumu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9691/4586/files/22065744981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/the_wizard_and_the_hopping_pot_review.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1E 5436 bytes
SHA-256: d36e66c856750e66bd9de5dcbd810753e4529acff7ffa10699cb2208c4ec8b28
font_01_sfnt_off000070b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B2 10280 bytes
SHA-256: 8ee800b2c2bccad7c34ec132912b76be245ade254816c43881c548ac4b0b957c

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