Malicious PDF — malware analysis report

Static analysis result for SHA-256 38284b11cfc977a1…

MALICIOUS

PDF

41.9 KB Created: 2020-08-07 23:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0fd53ea107d5f46fc8490b320f69276 SHA-1: 6b3d938b1c126a4b5d75c4fcdb701049f1fa2f57 SHA-256: 38284b11cfc977a111801727690b256debecf18eb800bf1192e822d3730e2fea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=acretismo+placentario+ultrasonido+pdf
    • http://files.jordansidfield.com/uploads/1/3/1/6/131607600/6104639.pdf
    • http://merajenug.sigma.graphics/uploads/1/3/1/0/131070872/xanunel-nojumagefol-kepuvezoju-gotut.pdf
    • http://files.chaseaviation.com/uploads/1/3/1/6/131606169/lagadubipakuloj-rexojetebiwamid.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/56655212121.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/43217979591.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/nomerimejibanumujedekawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3968/5799/files/65310647713.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/pagexoma.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/40830210404.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7270/files/dibiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/89500212444.pdf
    • https://cdn.shopify.com/s/files/1/0438/9987/9576/files/beast_conclave_5e.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_off00005984.bin
231cc2edd74a2978dd25d529ee973a33b4a79c78558219c83d17c675774aabe8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5984 5172 bytes
font_01_sfnt_off00006af4.bin
3db3fd8ce169171b29f64c5a68acb57214467691c448ab8d85bcb95411842867
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF4 9908 bytes
font_02_sfnt_off00008ced.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CED 4324 bytes