Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39d6a531f799863…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 20:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a5a3eab874e2800dc38def6f7bbcb7 SHA-1: 1d2c5534599ac7b0415e54801c5823edd278510f SHA-256: f39d6a531f799863fd5fd7d5639813d833ace6876cbd1b4799b3b30467bef92e
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 external resources, indicating a link farm. One of these links, https://ttraff.cc/wix?keyword=jim%2527s+weight+training, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious URL.

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=jim%2527s+weight+training
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/97689341235.pdf
    • https://cdn.shopify.com/s/files/1/0435/4034/9082/files/diabetic_meal_plan_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/50606662811.pdf
    • https://cdn.shopify.com/s/files/1/0432/3871/9648/files/94430639093.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e2d96e8b664eca90f671195c5a7cb4.pdf
    • https://static.usrfiles.com/ugd/0d002d_eb6111fdb2624bb5a9aca52cdda4a99d.pdf
    • https://static.usrfiles.com/ugd/1b8612_ef2144275c384d0a97592f751eee6558.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df74262b403471d8adc9018a728f5bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_685bba00e4ab4db9b3a08a512e85b923.pdf
    • https://static.usrfiles.com/ugd/c068f8_ea66ff2f17f04b7a98f76c2c9d752134.pdf
    • https://static.usrfiles.com/ugd/b8c837_139a9c5d3b4441b29ca999ea5cdc596e.pdf
    • https://static.usrfiles.com/ugd/8b2c09_6b4a641169ef4d7383935b0567684368.pdf
    • https://cdn.shopify.com/s/files/1/0436/3714/5753/files/fiweligolakuzaban.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/26637816124.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ca.bin
134829206d002b5f3c4e143964097c258f3c3196674b42d3f3eba2b8ea25ec02
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 4860 bytes
font_01_sfnt_off0000712c.bin
caff2e48f2cf3ab2fb4ab6a574684b97aff502d7885f030389f43e685998896f
pdf-font-stream PDF embedded font (sfnt) at offset 0x712C 10532 bytes
font_02_sfnt_off0000951d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x951D 4324 bytes