Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17c8c1377ba07a4…

MALICIOUS

PDF

53.8 KB Created: 2020-08-09 23:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0831ce8740a9e6a076a10c6ee49a5ba2 SHA-1: 2707220790636e756e84a27b6444e7605eb0ae87 SHA-256: d17c8c1377ba07a4d98238abe15223219d1612b83d90b36a65cc65c7df5407d7
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning model as malicious and contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO abuse. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL. The primary purpose appears to be directing users to potentially harmful external content.

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=prevention+of+food+adulteration+pdf
    • http://files.bckprograms.org/uploads/1/3/1/6/131636855/16d59467b33.pdf
    • http://files.eyebelieveeyecan.com/uploads/1/3/0/8/130813381/acd95e.pdf
    • http://foregen.ohiotestprep.com/uploads/1/3/0/7/130776483/xujitopomub.pdf
    • http://files.dtmstudios.com/uploads/1/3/1/4/131453056/zojeno_posoj_wutinovagazup_pezizi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7640/9751/files/rekepefeludogurog.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/bujidobagiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3507/files/36386911365.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65621046881.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6738/files/tolinisusipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/que_es_preeclampsia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7528/files/modern_periodic_table_with_full_names.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/43868426119.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/felofamujowekovulatot.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/josuzeb.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_off00008f46.bin
22b2430185985b65aa244a04741d27b6f64552b4e451c38f7d28a832a2bf2d7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F46 4916 bytes
font_01_sfnt_off0000a016.bin
eaab4a11c222d7becff7c8d9b576fc1b360d97a120eba0c192a3f80bc551cbb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xA016 13024 bytes