Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a0d4df19819e69…

MALICIOUS

PDF

67.7 KB Created: 2020-09-13 00:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7bb55a668edd85ec0716f78c482fdd1 SHA-1: 8d7d9f5dedcc9dd4a44608f68192b6cc3faa345b SHA-256: 73a0d4df19819e697bf9400493dedc56cbd1d3518af042dadc8614e0a1666855
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to a 'free no trespassing letter template' and the URLs themselves suggest a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=free+no+trespassing+letter+template
    • http://wawutenew.akoyahealthandwellbeing.com/uploads/1/3/1/4/131437622/2887418.pdf
    • http://vegijem.berrienspringsvirtualacademy.com/uploads/1/3/2/7/132712116/kulazine.pdf
    • http://files.qmworkplacement.com/uploads/1/3/1/6/131636697/41322fe.pdf
    • http://files.seectimeout.net/uploads/1/3/1/8/131871622/jitabatas.pdf
    • http://files.fussball-musings.com/uploads/1/3/2/6/132695571/sedigitova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/13ae68_01b962a5451e484ead67b26652605a40.pdf
    • https://static.usrfiles.com/ugd/1df9ea_c1fe2a467fab4e6f9ced44878e911e13.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/lmg_mounted_and_loaded.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/mulozabiwokejixivitel.pdf
    • https://cdn.shopify.com/s/files/1/0435/6407/3128/files/apprendre_a_lire_cp.pdf
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/dillon_s_auto_salvage.pdf
    • https://cdn.shopify.com/s/files/1/0429/3751/6191/files/tekken_3_game_install_now.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6799/files/77040794499.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b730.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 2828 bytes
font_01_sfnt_off0000c12a.bin
08bc88dbc09d682eb93f5d5a1a400949d99761d9ef668e5fbce2ca5488908ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 4880 bytes
font_02_sfnt_off0000d1a3.bin
1285db3ba696eb7b267c8f0f9ffa2e01886f88f583506d33f7ac39bb8f2bceea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 9904 bytes
font_03_sfnt_off0000f37d.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 4324 bytes

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