Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a333cad75fe08f…

MALICIOUS

PDF

83.5 KB Created: 2020-09-01 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab4a2adfa3af6c72328dddf54d8708a6 SHA-1: 211eba677307d4e2f1ae3b627f6505bd1cdbb2fc SHA-256: 64a333cad75fe08f7ae18854028d54ad08346b1153689dce79f26dc76b1914d6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm, likely intended to lure users to malicious sites for phishing or malware delivery. No scripts were extracted, but the presence of embedded URLs and the redirector link are key indicators.

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.ru/wix?keyword=balkan+wars+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1796ddaa77c143c68fd607b0def975dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_9de39514f661457f85d44fcf7b7d49b6.pdf
    • https://static.usrfiles.com/ugd/0d002d_93f204cc6ca044ae87b04c7a8445135e.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_1a39e04cd696498bb48f0d14e19ddc7a.pdf
    • https://static.usrfiles.com/ugd/d1c05f_82ac7c709015403f8985d232ebb5a901.pdf
    • https://static.usrfiles.com/ugd/8e1900_9e3d43cb04e94aedaec8ad7594b75572.pdf
    • https://static.usrfiles.com/ugd/76156b_b37be2f1334142c08e0753b29298d5a5.pdf
    • https://static.usrfiles.com/ugd/9ec29b_6067e4ba38444c41b72843907669fed2.pdf
    • https://static.usrfiles.com/ugd/a76634_074f2c526d0641649e632b1aaecfb580.pdf
    • https://static.usrfiles.com/ugd/b8c837_c558f0fe94124d7e8cb83514f51fbdba.pdf
    • https://static.usrfiles.com/ugd/5be868_29fde5d048e64133bd701f3005a7c5cd.pdf
    • https://static.usrfiles.com/ugd/b914b5_6eb23b59b2044bc284f441b25955fb9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_87f33e0bafed4d5fab536b8245b00c96.pdf
    • https://static.usrfiles.com/ugd/67f5f7_1e79f8e36802432689b475c3ed6d5645.pdf
    • https://static.usrfiles.com/ugd/97493d_8ceb97c418e44c28abaa7bad195e91db.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_off0000fa4a.bin
c90c8a6f750396ef1ddd2616605f4b92e01128e09d20c7ab99b6a23f4d7ec585
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 5240 bytes
font_01_sfnt_off00010c40.bin
52f078b1830b93c9b718f467db7ba777f400731e1e94bb19316b68e85d87dd04
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 17356 bytes