Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf86c909f4a30376…

MALICIOUS

PDF

44.6 KB Created: 2020-08-25 11:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7d725a08567e8559e4af22a8c89d2f SHA-1: bec62cb31145b5d2386eb2de96d4455a78a9cf78 SHA-256: bf86c909f4a30376b417118be109a6d2c82f71012e9fe67d1af3f0ad631c1985
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=arterial+line+procedure+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to trick users into clicking this link. The presence of 18 PDF links within a small document further indicates a link farm or SEO poisoning tactic, aiming to attract unsuspecting users.

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=arterial+line+procedure+pdf
    • http://zulon.qmhiconsulting.com/uploads/1/3/0/7/130775918/woveperoraw.pdf
    • http://sinot.georginamurrayart.co.uk/uploads/1/3/0/7/130738684/1801712.pdf
    • http://zizivirar.kathleenwestergaard.com/uploads/1/3/2/6/132681481/5219444.pdf
    • http://files.craftychefs.co.uk/uploads/1/3/2/7/132710762/fekatuzodabikeril.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9509/files/fatin_shidqia_yang_terdalam.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/vawimejusogunozilafi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/93097385995.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/japowo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/myanmar_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/biological_classification_objective_questions.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/carolina_mammal_heart_dissection_guide.pdf
    • https://cdn.shopify.com/s/files/1/0462/7041/4999/files/busybox_non_root_apk.pdf
    • https://cdn.shopify.com/s/files/1/0457/6808/1574/files/emperor_scorpion_sting_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/1417/4358/files/cognos_report_studio_training_material.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/guweralim.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/best_new_android_apps_2019.pdf
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/bowukokezuxegugixabanamen.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/lilutozuniwiropeza.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_off000071e5.bin
5812c3c54dabb168be733a0187b4c413bcf5dbc5fc2eaa8a5ff2eecf6339f354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E5 4960 bytes
font_01_sfnt_off000082cc.bin
e08126f300e3e4bde1f13a71e88eac0c9506284abdf4242a919d74226f3270b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 10080 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.