Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1001c03dba15e2…

MALICIOUS

PDF

46.3 KB Created: 2020-08-06 08:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d258793250c7a6f988b6db36b7d3c2b8 SHA-1: 3f3ac14769d1741065eea4c28f52a5d2d5d34fbb SHA-256: 9b1001c03dba15e267ac7972151ff4cbb817f4e92af06bd4937da7e1caffe562
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to `ttraff.ru`. The document body, though partially corrupted, contains the same search query as the redirector URL, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=before+i+go+to+sleep+read+online+pdf
    • http://files.playsafeclub.com/uploads/1/3/0/8/130874154/7462841.pdf
    • http://files.ebfisher.com/uploads/1/3/0/7/130775992/nomewi.pdf
    • http://files.flaviolombardo.com/uploads/1/3/1/4/131437736/rejuk_turasaramafesel.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/41751181152.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3218030698.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/67238742927.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/dubabunotefesuzovitepite.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/84282146937.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/zomanojabetevetugarepome.pdf
    • https://cdn.shopify.com/s/files/1/0437/4003/7271/files/witesonofepekej.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/xupunigaviwupuwebuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/jatamitometuxezaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/75698154259.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007626.bin
5d697446c0c2ddcbfa20f45ca53a24d36960ef0487a9acafe85324822b57ab63
pdf-font-stream PDF embedded font (sfnt) at offset 0x7626 5260 bytes
font_01_sfnt_off00008822.bin
b8da9c0c96fe76111f67c09da55059288d56cd95b58e8dae57d1c5eb465be744
pdf-font-stream PDF embedded font (sfnt) at offset 0x8822 10516 bytes