Malicious PDF — malware analysis report

Static analysis result for SHA-256 756dda0849dd590f…

MALICIOUS

PDF

44.5 KB Created: 2020-08-23 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce1f9e7ed678c91aa5717a17f4293313 SHA-1: e2fbdf43c13b9970a4d722ad58d7806e4ac25280 SHA-256: 756dda0849dd590f0f14c269f49ccd5db722c3ed88e65418df9313464fe770b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector or phishing attempt.

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.com/pify?keyword=civ+6+gs+australia+guide
    • http://javuji.nightriserscon.com/uploads/1/3/1/3/131379362/b356b27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/kubernetes_session_affinity.pdf
    • https://cdn.shopify.com/s/files/1/0432/0906/4603/files/sefizapomirazofabipo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/car_racing_game_hack_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/bogaxunisuvukudimunam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/abandon_all_hope_rpg.pdf
    • https://cdn.shopify.com/s/files/1/0439/0082/9848/files/78807909811.pdf
    • https://cdn.shopify.com/s/files/1/0433/9587/4979/files/kekagipix.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/sifena.pdf
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/kujefunox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/esc_guidelines_2017_carotid_stenosis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18608783112.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/time_complexity_of_recursion.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/24449942922.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645d.bin
b64389c06832628e50d864c5ca659c0368f68a6fe6dfdfd6453d30394cd8a96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645D 4896 bytes
font_01_sfnt_off00007513.bin
2c2c7890e977b3cb6c1bad123d56198fc3e693009a20d6892ca8e6b325e14425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7513 9976 bytes
font_02_sfnt_off00009744.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9744 4324 bytes

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