Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff186dcd1831541…

MALICIOUS

PDF

48.1 KB Created: 2020-08-18 17:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c4e85c37303e18301468b6f3b48428 SHA-1: 4654407bc1a4264bd8745702828c0e7cf8678141 SHA-256: cff186dcd1831541fd2c82d996398d1773309d66a416dfef8d798d7402af1219
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains references to 'employee attendance system pdf' and multiple URLs, including a redirector at 'https://ttraff.cc/pify?keyword=employee+attendance+system+pdf'. The presence of a large number of external PDF links suggests a link farm designed to distribute malicious 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.cc/pify?keyword=employee+attendance+system+pdf
    • http://kabaraw.comfortdogsfortworth.com/uploads/1/3/1/3/131398097/6788386.pdf
    • http://files.ymcalift.com/uploads/1/3/0/7/130775126/7f20fda8f598.pdf
    • https://cdn.shopify.com/s/files/1/0434/1484/7655/files/sisebawigikinapize.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/waroxek.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/regebevotipenos.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/7591149736.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83142526711.pdf
    • https://cdn.shopify.com/s/files/1/0447/1321/4108/files/architecting_for_scale_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/gewafelawisafipuxovaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/calisthenics_workout_plan_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/zobexonaramifu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7787/6377/files/97353748807.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/28869823751.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/58382215660.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_off00007e89.bin
56f9b5db36964c7fbbfc13af9e8115e1dca0331300993695eb43005c11c7aab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E89 5264 bytes
font_01_sfnt_off00009066.bin
24f1f4110a008df3806e5e3e056c24e70666c66e420480f0ef5699194ed8c2da
pdf-font-stream PDF embedded font (sfnt) at offset 0x9066 10204 bytes