Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dbb6a581bda0ba…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 10:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8dd0f16397e9b8b5fe38dfb8e071453 SHA-1: 38e47250f0d2c95f91568a2e2fa2dc1113b8510f SHA-256: 11dbb6a581bda0bac39bff59e2c2132939c71da45e40f4172d3468efbfd1e2c1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link to 'ttraff.ru' suggests an attempt to direct users to potentially harmful content. The document body, though heavily obfuscated, contains the URL and appears to be a lure for users interested in beauty or cosmetic guides.

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.ru/wix?keyword=face+contouring+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_892d3fbbb69d41a09f1340ce68271130.pdf
    • https://static.usrfiles.com/ugd/51c472_fcf8e396efbf4943bc92fec264e0cceb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a80bd6567bc415a91249fed35ff32d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce0eb75b390749449b9ce8ebc3cee67d.pdf
    • https://static.usrfiles.com/ugd/756799_3770e54e35f64383a21cff4be48bcec5.pdf
    • https://static.usrfiles.com/ugd/599f1c_602d47d04cb0473c8904486a93cb4fc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3841e60a445598df8d3c5c2635e84.pdf
    • https://static.usrfiles.com/ugd/09c3c7_42c9c4006cac4613bf3e9657da609abb.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c48052946144b0ab0da24408f636f6e.pdf
    • https://static.usrfiles.com/ugd/0a51c1_0450b18e44ca444b9fde45090423489f.pdf
    • https://static.usrfiles.com/ugd/82e28d_80ab76be4a3c4e5496cd3a5209a8b3f4.pdf
    • https://cdn.shopify.com/s/files/1/0459/8271/1970/files/47978413657.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9680/files/80497053422.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/20628127761.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_off000065a6.bin
c70778a1a05ebe10dcdf03773790dfd9006d658d645bdcc3c473ec832157760b
pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 4852 bytes
font_01_sfnt_off0000762d.bin
ec3f7cdcc6e618c70d5cf28b9e1af23c7a3a2a781a2d34e811f524914463d8cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x762D 9984 bytes