Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc7dc754b34143c…

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 23:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c4bb1c0678a38bfcf754a542e4d72d SHA-1: 39e0f34043d986031be2a949cb07efa8496e60e1 SHA-256: 7fc7dc754b34143c59f71f65999ddc90d5003650a07bb41819bec76c60731316
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a SEO link farm strategy, likely to drive traffic to malicious sites. 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/wix?keyword=dr+gundry+diet+evolution
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_464caf8764254d4f9b7d54c1c6813de3.pdf
    • https://static.usrfiles.com/ugd/b8c837_821b45cd8966440ba66dbcaf78623e81.pdf
    • https://static.usrfiles.com/ugd/b8c837_508655159a0645a7909732b7f5967ee4.pdf
    • https://static.usrfiles.com/ugd/4b7290_ef002857d1ec4748b7a5805c962dff1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b11887d8f7c40c7922343d1fcf48a53.pdf
    • https://static.usrfiles.com/ugd/4c1554_223d416d761c4a6cb15d4f200d0a99bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4837befdb2a4bf5a76f523b1d8c8e87.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f3cd09ffc994c1f9ca8a27c62383c76.pdf
    • https://static.usrfiles.com/ugd/b8c837_0575b038a9734f3d914b65e489cd4a48.pdf
    • https://static.usrfiles.com/ugd/b42fd6_51cad7bb3f7d4458a61dbcfbb951c274.pdf
    • https://static.usrfiles.com/ugd/b8c837_dee5f9119ca9496b8e257bf3d5b4446f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2813e3612024092b46563c5f60a23ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_eeb3b2e7382c4d3a8e6af164e73f8587.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd8539a7c5b848be8d4ab155ebe52973.pdf
    • https://static.usrfiles.com/ugd/0a593f_ba79e624f2e24a5cba37b676d2f45ec7.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_off00006c3d.bin
0bacb162d7045811734c349d9823c688da0b308063274d6d84c5e44264442cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3D 4768 bytes
font_01_sfnt_off00007c8e.bin
81bb209a3944f2cf44dbdc2d7a4e21d3a357a01eb3edb77e4639568b44bf729e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8E 10472 bytes