Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cebdd1f2058f88…

MALICIOUS

PDF

42.4 KB Created: 2020-08-01 23:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6f9215408d916f895c6a2d4291a54b SHA-1: e062469bcdee5cd535a2a6534cf9d5c3b5ca2021 SHA-256: 16cebdd1f2058f8863fdbc8b319be87cd0febcb0a8fd29a71c2a1d79bbf8b516
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on Shopify, suggesting a link farm or content distribution strategy. One critical heuristic identified a link to a known malicious redirector, ttraff.com, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest an intent to lure users to malicious sites.

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=magellan+mistro+4250
    • http://files.wenatcheevalleyrappellers.com/uploads/1/3/1/0/131070826/lopabivozona-nogedevuliteb-budofepegoxos-jotepiwor.pdf
    • http://files.1travelshop.com/uploads/1/3/0/8/130813639/zibajotumipazav_tunafe_tukiseti_zetakomu.pdf
    • http://files.shsoh.com/uploads/1/3/2/7/132712093/vurawisopo.pdf
    • http://files.bobgraysonart.com/uploads/1/3/1/4/131407547/worixakuwinoxuzug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/guitar_hero_on_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/47955315984.pdf
    • https://cdn.shopify.com/s/files/1/0428/7001/4111/files/32021812546.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/zebutupirinobopidovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/42601152570.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/jopakefaguw.pdf
    • https://cdn.shopify.com/s/files/1/0439/3874/2430/files/77266595016.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/fimew.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/92304298169.pdf
    • https://cdn.shopify.com/s/files/1/0431/4438/0578/files/zamonezejalunen.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/verajiloponajivuvapudowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/27487084984.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/xekas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000675a.bin
6084d329838f6133c06b275f6adf4b1e3471a2ed22e5c59967487898ff34228e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675A 5496 bytes
font_01_sfnt_off00007a0a.bin
6726e81219499404eb1a865907c4be79a4f5542517b359c43345b329fc884e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 10144 bytes

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