Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad8e4f1a7979919…

MALICIOUS

PDF

51.6 KB Created: 2020-10-17 01:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba6d40b86d5ce61aa03eb8cee941bd2 SHA-1: 451af1fed27f69347ee8f45ce5442d075153bb0a SHA-256: 8ad8e4f1a79799197b506304b7f5036d886805b4c01cd0fde697459f7d1c6d9f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/123?keyword=warface+global+operations+android+apk', suggesting a lure for downloading files. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, but the primary redirector is suspicious. The ML classifier also strongly flagged this PDF as malicious.

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.club/123?keyword=warface+global+operations+android+apk
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f89e686cdc66.pdf
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f88947338b9c.pdf
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f8a11c1f1c5e.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f87a4ac2e370.pdf
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f89cb7dc96cf.pdf
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8827ad80bbc.pdf
    • https://cdn.shopify.com/s/files/1/0499/4609/9866/files/download_converter_to_word_en_excel.pdf
    • https://cdn.shopify.com/s/files/1/0466/5281/7573/files/last_battleground_mech_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/runescape_disassemble_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3269/0339/files/condor_wheel_chock.pdf
    • https://uploads.strikinglycdn.com/files/fd2bfa94-7af3-45ef-8611-ee09a20ac69a/kajilan.pdf
    • https://cdn.shopify.com/s/files/1/0500/7435/3850/files/20871675133.pdf
    • https://cdn.shopify.com/s/files/1/0482/4986/4353/files/dobupixomebolofatuvexi.pdf
    • https://cdn.shopify.com/s/files/1/0493/2360/6175/files/jepigonefibakaginetakotij.pdf
    • https://cdn.shopify.com/s/files/1/0484/9519/8363/files/best_masticating_juicer_for_wheatgrass.pdf
    • https://cdn.shopify.com/s/files/1/0268/7270/9313/files/american_hustle_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9491/5738/files/golds_gym_power_axis.pdf
    • https://cdn.shopify.com/s/files/1/0501/9828/2420/files/android_unbound_prefix_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f1.bin
2ba9e9d45cb1a2da8148895fe5f9e848d56f8ba05de1bcb6041cb57bf37e0302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 5540 bytes
font_01_sfnt_off00007bdc.bin
453c0b1c3e6d0b08d54b87c5f4d85601353bb418ee8dc53bbd829d1be9aa3e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDC 14548 bytes
font_02_sfnt_off0000a9cd.bin
e7985c0e789db4fe31ca58f0ff62c473d7a5ad33ae8cdd15d244e5d72cc93c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9CD 16612 bytes

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