Malicious PDF — malware analysis report

Static analysis result for SHA-256 1982c44a239e1796…

MALICIOUS

PDF

51.0 KB Created: 2020-08-30 07:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3215bb160aad6d9e13fc1e7b06223a0b SHA-1: 433cce59ed903ba6e32f086e02564279bd22113b SHA-256: 1982c44a239e1796e6ba509d6bd151acf0aa51dc5cb6a26a502af8edbdfabd0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Sims 4 autonomy mod'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. 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=sims+4+autonomy+mod
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/remegexuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8050/files/suxatiremajamofedafapadax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/41077729673.pdf
    • https://cdn.shopify.com/s/files/1/0461/6683/5352/files/hireright_background_check_sample_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigirerunozekolufis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/alimentos_ricos_en_zinc.pdf
    • https://static.usrfiles.com/ugd/9c43ec_a16ca70af70b4da9a5935b2fbddbbcc9.pdf
    • https://static.usrfiles.com/ugd/80c1db_a34d60c0d5f64ef7aa0d46180dab27b9.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8529/files/what_is_the_black_stuff_under_my_fin.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/30482255903.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_off000089a6.bin
5167d26d1cf178a0104560db064b6670b1593b6ad75e0049fe4602248305da8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x89A6 5136 bytes
font_01_sfnt_off00009b0d.bin
61a71a3b0429e86b5e8a0e70bc5b54546b87658d0e0471f256e1ac9193c7a8b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0D 10888 bytes