Malicious PDF — malware analysis report

Static analysis result for SHA-256 8835e4c91f8fd3a8…

MALICIOUS

PDF

68.4 KB Created: 2020-08-06 01:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f54eeb9dc1eb3f4674ba1e64305196 SHA-1: d8d8a9f4a49afa59cc4f0d396ebe863d0c4abb17 SHA-256: 8835e4c91f8fd3a806ab679fbbf25bbce2752cec6e5252d728882f7fec010038
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=muscle+hypertrophy+workout+pdf'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The PDF also contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation to improve search engine ranking for malicious content. 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.cc/pify?keyword=muscle+hypertrophy+workout+pdf
    • http://rafoto.thegreenhouseac.com/uploads/1/3/0/7/130776611/dilelidi.pdf
    • http://files.protectthegame.com/uploads/1/3/2/8/132814958/63b927.pdf
    • http://files.silas-house.com/uploads/1/3/1/3/131380728/0a293b781.pdf
    • http://files.tailoredtrainingnarberth.com/uploads/1/3/0/7/130739204/mofivedopize.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xirapekewovefosisukepeja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7291/3557/files/valsartan_davis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/ponuxoxagulufotuxito.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/maruvitumiselaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/saridufen.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/tuzizomem.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/67201406019.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/tomosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8173/files/baloncesto_en_silla_de_ruedas_reglamento.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/
    • https://cdn.shopify.com/s/files/1/0433/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c085.bin
9cfb8aefeee7e70ab7c22f8c880f317e8ee5f63425308f97a5c35f3a115c9819
pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 5024 bytes
font_01_sfnt_off0000d1d6.bin
93f93c3958e93f421c867c57255eb27b68ed30bcc501f90a8cb9c52d21b04fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 10928 bytes
font_02_sfnt_off0000f668.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 4324 bytes