Malicious PDF — malware analysis report

Static analysis result for SHA-256 604385d9fbaa67c3…

MALICIOUS

PDF

41.9 KB Created: 2020-09-11 00:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2999f6e30301b1d89d1bd756464bd976 SHA-1: 61d2ab9179e0dd0e6a2b854e06cd59f9d6d98287 SHA-256: 604385d9fbaa67c30b04b341d9abf04fcd802dc7fa7101fc91eb5e05ce4c115c
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, presented as a link farm, with one primary malicious redirector URL. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick users into clicking through to potentially harmful 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.club/wix?keyword=chest+guidelines+2012+vte
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/florida_profit_corporation_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/xofowuwalabubudevinonixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/jerevofenofewoka.pdf
    • https://cdn.shopify.com/s/files/1/0439/0718/6843/files/86029938045.pdf
    • https://static.usrfiles.com/ugd/e73fea_9da271d565c140a699eb017d49a569f4.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/wujetoduvupogimoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5783/files/nufelijuwiketezopizimu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2547/1400/files/bloody_roar_2_full.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/functional_programming_tutorial.pdf
    • https://static.usrfiles.com/ugd/b8c837_544ae77e816c44e1973680b0bd586a8c.pdf
    • https://static.usrfiles.com/ugd/31bf02_5e6224d077384492a3f5dd6959baf387.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_off00005a80.bin
6c66b9abf6a3b6ff8e2b44185167839cb6b0c0c4a1f1d76456d2db0c5d590562
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A80 4960 bytes
font_01_sfnt_off00006b69.bin
9ce92c552f6768dc6cf5ca7c2f6cada5c3e6a9e0b956d7ec698e13321e78f3aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B69 9860 bytes
font_02_sfnt_off00008d34.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D34 4324 bytes