Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba73154ad4eb8c5…

MALICIOUS

PDF

54.1 KB Created: 2020-08-30 01:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316013149831ad00332d65531c7eb580 SHA-1: 226f7e1e82233599886dfcc25f747ef11ec55e8e SHA-256: 4ba73154ad4eb8c54ee7506d2c83e34b7cbceeac4e37356d9c5c9cfbfe8383a4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com, and one critical redirector link to ttraff.me. This indicates a phishing or malicious redirection attempt. The ML classifier strongly supports the malicious verdict. No scripts were extracted from this sample.

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.me/wix?keyword=vw+atlas+owners+manual+online
    • https://cdn.shopify.com/s/files/1/0429/5449/0012/files/zuponebuzuxasovogoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4000/4501/files/caduet_dosage_forms.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/forasopijafonotobojak.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/keynote_template_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/star_wars_battlefront_2_credits.pdf
    • https://static.usrfiles.com/ugd/50c35f_465b20cb37804c3cab620f4f6e3f6b2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dd0371af56e42128cb15d9a4eb90424.pdf
    • https://static.usrfiles.com/ugd/c1de29_c2bf9ad5d921441c99709c5a14d57719.pdf
    • https://static.usrfiles.com/ugd/289c5e_dc9c8d1f3410489eafbcb3fa63350897.pdf
    • https://static.usrfiles.com/ugd/b8c837_b199982e9424494faa47077ed883b1b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f98fac90fa214322abfe941517a167fb.pdf
    • https://static.usrfiles.com/ugd/07625c_e4f4414cb14649a793675e162f94afea.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072f8.bin
26aecd7ab510d24b6060f90153dcbc4a0d6e12113619a621b64c61b3ed15e76b
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F8 4768 bytes
font_01_sfnt_off00008318.bin
cf15c914d4afab8e42137bdde19869988f41f1b6aae45a85c327387e7ad17d24
pdf-font-stream PDF embedded font (sfnt) at offset 0x8318 10588 bytes
font_02_sfnt_off0000a79c.bin
c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826
pdf-font-stream PDF embedded font (sfnt) at offset 0xA79C 16376 bytes
font_03_sfnt_off0000bd44.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 4324 bytes