Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63ee93da196dae7…

MALICIOUS

PDF

55.2 KB Created: 2020-08-22 02:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d47da23c56cb1894c53a5e75e8e44e SHA-1: 0936aa39c4dc71e317bd3dbcce8e5cdbe91df269 SHA-256: a63ee93da196dae796d79dbd30ce88f4ec011b759126cfbd5340d048b63371cb
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a link farm with numerous external PDF links, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.cc/pify?keyword=20+ga+sheet+metal+thickness, which is likely used to direct users to a phishing or malware-hosting site. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to lure users to harmful content.

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.cc/pify?keyword=20+ga+sheet+metal+thickness
    • http://files.kandersonmusic.net/uploads/1/3/1/1/131163949/bisivutumakobijuferi.pdf
    • http://files.bandenservice4u.nl/uploads/1/3/1/8/131871602/a2951691e6c5f.pdf
    • https://cdn.shopify.com/s/files/1/0432/6316/4580/files/kaplan_clinical_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/vakunivazikepefepujudeba.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/46460926761.pdf
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/pixide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4101/files/how_to_use_notepad_for_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/red_chinchompa_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0447/8684/3799/files/95914852377.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/job_interview_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2965/files/seemingly_unrelated_regression_model.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5536/files/pdf_to_word_converter_software_download_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/13238970959.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4661/files/jidopiwezoverexu.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_off00009a11.bin
cf7b83b9be101ed800a952cf86a56921cee14af3767a56fea5e929ab56e26b80
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A11 5360 bytes
font_01_sfnt_off0000ac28.bin
355f7666be96ae073effb54e6e218606050274640feb4dc012a1c549df2709a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC28 10420 bytes