Malicious PDF — malware analysis report

Static analysis result for SHA-256 72843af5897ecfc8…

MALICIOUS

PDF

48.5 KB Created: 2020-09-04 01:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cce1f84451f0882a9f64877e2bbdd33 SHA-1: 7c37d84eb4599738d815b6e619702a9344ea6b34 SHA-256: 72843af5897ecfc8bffdf1c7efe395e06f30113f2578e1eb12faafc1d480833e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'security access control procedure pdf', likely a lure. The presence of numerous external PDF links also suggests a link farm, a common tactic for SEO poisoning or distributing malicious content.

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.link/pify?keyword=security+access+control+procedure+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e62cfd464b1a416fb85931d185a71ad7.pdf
    • https://static.usrfiles.com/ugd/b8c837_2efdc721c5be42a198a14bccc0e9b925.pdf
    • https://static.usrfiles.com/ugd/122077_e2441a35406b444492b04c491125c9bf.pdf
    • https://static.usrfiles.com/ugd/8c0e65_03e383ed497c4e1a8bfe992cd43abb93.pdf
    • https://static.usrfiles.com/ugd/544e7e_72a2b58d95f24aeb9f69c5f91150b151.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e3500285b94696bd11af5ced4611ed.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_cf5d4093d22c4c18862a512942896fe2.pdf
    • https://static.usrfiles.com/ugd/4725f1_d13c3b061c3745f98f7bbe8a708274fe.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_53288edf3c4a4c1c90cc50cdcd0d038b.pdf
    • https://static.usrfiles.com/ugd/8e66a5_c42d4feb0fa9437e8d0ce006cffdf588.pdf
    • https://static.usrfiles.com/ugd/c63dba_295bf9693cd94af885c9c6159411f433.pdf
    • https://static.usrfiles.com/ugd/6f58fb_d69c5d188db14916b425101bf29c1c10.pdf
    • https://static.usrfiles.com/ugd/48d9a1_d2a91d0ec86b48e59afff0fad0aa0d90.pdf
    • https://static.usrfiles.com/ugd/e2c250_12fc4f28d2324b15b309ae374b03e08e.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_off00007ca5.bin
0d59402474d4041351988c6748c22f693d4950bb88feed8ba17a89b0c97076ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA5 5352 bytes
font_01_sfnt_off00008ef3.bin
848f568d4a09e3cb41710111fb545cabf300621e54b655439df550a6176be3a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF3 11660 bytes