Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee4f1c3d203cf76…

MALICIOUS

PDF

71.4 KB Created: 2020-08-08 04:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc26813e66e185a7a51e25e51924fe6d SHA-1: b2ad2f15088179a4d4a2b6f8a2efb47b2410045d SHA-256: aee4f1c3d203cf766f66655a02151eff4f18ac844ad2259b514d426388c78575
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link farm containing numerous external links, with one specifically pointing to known malicious redirector infrastructure. The embedded URL 'https://ttraff.cc/pify?keyword=academic+word+list+english+german+pdf' is a primary indicator of this malicious activity. The document body, though heavily obfuscated, contains this URL, reinforcing the attack pattern. The presence of multiple Shopify-hosted PDF links suggests an attempt to create SEO spam or a deceptive content delivery mechanism.

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=academic+word+list+english+german+pdf
    • http://files.accomplishedteachingny.org/uploads/1/3/1/4/131453465/2143170.pdf
    • http://files.teresacarosa.com/uploads/1/3/1/4/131483830/tixuwaw-zebeto.pdf
    • http://files.gillysalmon.com/uploads/1/3/1/4/131452840/7e497ecee388.pdf
    • http://files.silversmithminiaturehorses.com/uploads/1/3/1/4/131405977/3559431.pdf
    • http://files.pitchervillesoap.com/uploads/1/3/1/3/131398555/2392687.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/10_000_reasons_bless_the_lord_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/kigudulonafupape.pdf
    • https://cdn.shopify.com/s/files/1/0438/8113/6296/files/bapepezivak.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/66579304717.pdf
    • https://cdn.shopify.com/s/files/1/0436/0791/6707/files/bolotalif.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/wusupixedilanivo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/xusegogixef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/26462206081.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3381/files/oxford_dictionary_english_to_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/40189580090.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/37492354837.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/college_physics_etkina_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/bioreactor_system_design_asenjo.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_off0000da93.bin
75bb9d10fd8c8fc2c93ed66e1155520fa9c19362041de06a78a252f6d5953287		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 5652 bytes
font_01_sfnt_off0000edb1.bin
345a2203239c0f69abd2f9d55cc49216b93797603ac0143eb42e7aacd13d33dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 10172 bytes

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