Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9e3b4eed64a646…

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 01:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d09a466d2edb83c70d3966873722686 SHA-1: e2350efc995cb1a9a9d54d88ec7cd23cbb51eedf SHA-256: 6e9e3b4eed64a64601466d9c13827bbb5d63b9e0fc13e532d8f30ccad6527d8c
154 Risk Score

Malware Insights

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

The PDF file contains a lure for "Google sheets offline mac" and embeds numerous links, one of which, https://ttraff.cc/wix?keyword=google+sheets+offline+mac, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of many external links suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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.cc/wix?keyword=google+sheets+offline+mac
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b97dd_cdf244d2474149cda2d8d2eeebe7d356.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ad9e121e30941b399d137c18de57ba9.pdf
    • https://static.usrfiles.com/ugd/04c368_f85ce68507484cb18152fdf101df5974.pdf
    • https://static.usrfiles.com/ugd/b8c837_54e8b102048c4dca9b8bdb9a244ef5ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1691e67d3f74d2f8ec86ef5bf96dfe1.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/wuxufujewokabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2352/2216/files/55620778125.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/gebunapewe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/22692491284.pdf
    • https://cdn.shopify.com/s/files/1/0433/5684/8282/files/55121916204.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a0b90329eae4c639336662e90f90bb4.pdf
    • https://static.usrfiles.com/ugd/83f04e_19c6b8aa60804613aa550ee0585e0027.pdf
    • https://static.usrfiles.com/ugd/599f1c_c54e1c5c82e54590abc80cfbfcb9f095.pdf
    • https://static.usrfiles.com/ugd/b8c837_b34d500d95844267aa7a0fb2f1b9653a.pdf
    • https://static.usrfiles.com/ugd/2b25b5_579918fb21f6492c832e719fda3b2cc1.pdf
    • https://static.usrfiles.com/ugd/0049ca_af990f5f036a4676a71bec004f9a5b4e.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_off00006273.bin
b2e255cf89d3a05cee2c4138c66ac28666d6db209a2bb276700d5f8c815c99e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6273 5232 bytes
font_01_sfnt_off00007423.bin
7620898e2ecc25d867406bf78da12866e4c420d0f706d0742a60fe7940242b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7423 9840 bytes