Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4e66f1ced6fd2f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-17 13:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dc6892432df970b168931e62cdc883d SHA-1: 1d660ab174d9aadfe2ede137121cc1f0f0bbfca1 SHA-256: ae4e66f1ced6fd2fb984f3d530eceb700201d1ba24ca47e65c916b7dd6b1b342
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Cochise stronghold guidebook' and the malicious URL, suggesting a lure to trick users into clicking the link.

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=cochise+stronghold+guidebook
    • http://files.chrismok.com/uploads/1/3/2/7/132710621/begedavotolala.pdf
    • http://domurije.villagiuli.com/uploads/1/3/1/6/131606617/3971603.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/ritozopen.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/naxobebotabewowujiresoba.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/vezujozawalifejopesoviz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/26382849839.pdf
    • https://cdn.shopify.com/s/files/1/0449/0684/0231/files/56940739586.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/62491651467.pdf
    • https://cdn.shopify.com/s/files/1/0433/4547/7783/files/sustainable_livestock_farming.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/pearson_sociology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/pudipojijo.pdf
    • https://cdn.shopify.com/s/files/1/0448/1240/2839/files/anesthesiology_self_assessment_and_board_review.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_off00006407.bin
1bf528ce72eba750ba2b39d7998c2c763cfaaf580bd4f86fb5317e3c7de65e2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6407 5100 bytes
font_01_sfnt_off0000754d.bin
df0850ea47c80f1287980d9bb1136957be4b4924d0ae6c141db3c0b19d2da040
pdf-font-stream PDF embedded font (sfnt) at offset 0x754D 10060 bytes