Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5124c9bc7fad825…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 02:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14fef58e30b105751e4a5ce99061ad72 SHA-1: 131084ca478867b3d49ef1bd3e31d1e376fb002b SHA-256: b5124c9bc7fad8255b9079f31692c81924342ddf84718ce38f13e5c9651e54c5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://ttraff.com/pify?keyword=internationalization+of+philippine+higher+education+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL and other benign-looking Shopify links, likely to lend credibility. The ML classifier 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.com/pify?keyword=internationalization+of+philippine+higher+education+pdf
    • http://pumog.agatficfinearts.com/uploads/1/3/2/8/132814930/nukovikavudixelimani.pdf
    • http://files.perrispawn.com/uploads/1/3/1/3/131383657/fexop_nebesadux.pdf
    • http://files.fisheye.lt/uploads/1/3/0/7/130775970/dikanudekegajapux.pdf
    • http://wimetini.bustingbibleignorance.com/uploads/1/3/1/4/131453133/beputikezaxa.pdf
    • http://files.quinta-milhafre.com/uploads/1/3/1/4/131437822/xizanenuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/7035/5611/files/anandi_vastu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/32724969851.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/15638007481.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/21555940679.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/70383749904.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0944/files/auslogic_boostspeed_8_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/58586993979.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/suvafez.pdf
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/24763306521.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/34901648656.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_off00005c49.bin
26c7b6714d5ebefd5762faf0f7b1185e58141ce1cf1a63e0b66c616542b81d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 5228 bytes
font_01_sfnt_off00006e05.bin
40a8438f093aae72891a9827b894c135fe16007dfc00afbc883555e82ff3bc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E05 10700 bytes

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