Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b7f083732418e3…

MALICIOUS

PDF

60.7 KB Created: 2020-08-19 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c80159fd8cec1e06366add50d970a1b6 SHA-1: a5be959f5ff1e53e7b19aaee17405064c405f464 SHA-256: 81b7f083732418e35de3e0746f1bbacafdb38192cecd9dcb6e034b91250920c2
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL and appears to be a lure related to a 'Baelsar wall guide'. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier 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.com/pify?keyword=baelsar+wall+guide+deutsch
    • http://rivijugu.bluewaterfmchurch.com/uploads/1/3/2/8/132814415/jizotabogenonowat.pdf
    • http://files.bellamcbride.ca/uploads/1/3/0/7/130776152/lamapusiv.pdf
    • http://xibuf.phesta.nl/uploads/1/3/1/0/131070152/zonovuza.pdf
    • http://files.nafoglobal.org/uploads/1/3/0/8/130814172/9673174.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/cancer_de_colon_derecho_e_izquierdo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/94017171155.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/96197089553.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/48060405753.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/wirejutip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0434/1311/0951/files/august_2020_current_affairs_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0455/6567/3637/files/cancer_de_tiroides_clasificacion.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/whatsapp_for_pc_windows_7_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0267/4845/files/34751014123.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082f5.bin
4ad361e39d3a49a5c4d2bf06c84e8ddb6e65b9bab563a9bc15d98292c101f2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F5 5008 bytes
font_01_sfnt_off0000941b.bin
f469a1888b3e24d2aa096cf3c2fffbe8bc509b9a8a72f5b94bea9af35df39b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941B 14960 bytes
font_02_sfnt_off0000c293.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC293 16092 bytes
font_03_sfnt_off0000d75b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 4324 bytes

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