Malicious PDF — malware analysis report

Static analysis result for SHA-256 1859101be5023c43…

MALICIOUS

PDF

38.5 KB Created: 2020-08-16 02:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04d33145f1318036e9dc967e5ef0ac2 SHA-1: a6e97a10867f4f5daf1cdd6c947c1f73de4fc39f SHA-256: 1859101be5023c435752115eb4920082573d6436fe4456ddb4c51934ad78561f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary link, 'https://ttraff.com/wb?keyword=s.t.a.b.l.e.%20program%20pdf', is identified as malicious. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a link farm intended to direct users to malicious content. 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.com/wb?keyword=s.t.a.b.l.e.%20program%20pdf
    • http://files.scrippsnorthstar.com/uploads/1/3/0/8/130874026/webus_kokitasumamu_topumoze.pdf
    • http://files.saintroch.net/uploads/1/3/1/8/131856365/cf09c1839ee10ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/16404338714.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/xizaxezijuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/gramsci_s_concept_of_hegemony.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/mathematical_logic_problems.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/bumimifinemewerixowuganu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2198/files/40364469842.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/38043749402.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/avengers_2019_full_movie_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0435/5024/5028/files/58065740854.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/45559573256.pdf
    • https://cdn.shopify.com/s/files/1/0438/5023/6054/files/79641019396.pdf
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/alpha_sapphire_cia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/26832020779.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/fetal_development_chart_month_by_month.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_off00004bba.bin
f96c17ed9d789679be9194358a6faf0872d584be6415847480e6cab2b8cc9e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BBA 5092 bytes
font_01_sfnt_off00005d07.bin
703f8f101c1def421fabfa4aa41519f0d6af08476e9d8908594aea65ad16f5fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D07 9936 bytes
font_02_sfnt_off00007ed9.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED9 4324 bytes

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