Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a11f1fb646043…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 14:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2bf6b805f1265b34e004b8ceae42eb7 SHA-1: 1410ff9870ee4b0bce55fae5c48ebefcd1bc2278 SHA-256: c21a11f1fb646043a4abbd56bc78071ee41f7e1807269d86e9f061012d7e64dc
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'https://ttraff.club/wix?keyword=film+interview+in+the+train'. Another heuristic indicated a 'PDF link farm' with many external links, suggesting a coordinated effort to distribute malicious content. The document body, though heavily obfuscated, contains the same URL, reinforcing its role as a lure.

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.club/wix?keyword=film+interview+in+the+train
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/28434665999.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/25600703951.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/32257350539.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/ff14_crafting_guide_5._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/afrikaans_dictionary_apkpure.pdf
    • https://static.usrfiles.com/ugd/9b5f63_8ac926053672402db1023ecb464c1125.pdf
    • https://static.usrfiles.com/ugd/e8506d_9da51d1c91e048db97e93bf42df2ecf0.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_3cb3c6535a3f42c491e97b6bbefd0e9f.pdf
    • https://static.usrfiles.com/ugd/d5cf39_9ad1fa766136497dbc2f154c699146d2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/nudomitafujen.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/sirawamufojibebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/46993884679.pdf
    • https://static.usrfiles.com/ugd/599026_52a3fc745db04934850aec5f556f6669.pdf
    • https://static.usrfiles.com/ugd/3bcfef_2368fedd862e428a926daed892e5c1b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6b1f197b51947cfb8d0d19ce9cda23c.pdf
    • https://static.usrfiles.com/ugd/912de2_b989811a0b89490daf1a856146aefa53.pdf
    • https://static.usrfiles.com/ugd/0286dd_e48b1ae396d840c5a8e0876bdf44a4b3.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_off0000782c.bin
b44c9d1608dbe053eac23f96ea6da8d541c308a2912a9c65b51e200e6cd67acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782C 4852 bytes
font_01_sfnt_off00008890.bin
88f8c1407f92518b41daba9facef79f98d23c4d9e3231d0804e7b99429fb99a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8890 10588 bytes

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