Malicious PDF — malware analysis report

Static analysis result for SHA-256 f386950a39ea401f…

MALICIOUS

PDF

43.9 KB Created: 2020-08-05 03:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2950ef63e2d7fd2c00a27b3b5daf5ae2 SHA-1: e37335321305ee8fd376b418fbe787d7aabcd749 SHA-256: f386950a39ea401fff7104335ba8e523f38f1d4ac4f1eeefad3767aa98e9f02d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final destination of the malicious payload. Another heuristic detected a large 'PDF link farm' with many external links, suggesting a SEO poisoning or link distribution tactic. The document body contains garbled text and a seemingly legitimate but ultimately malicious URL, further supporting the malicious intent.

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=chemistry+quiz+questions+and+answers+pdf+download
    • http://jaxadaxi.jacejavucce.com/uploads/1/3/0/7/130739678/cfe9b0c7e8.pdf
    • http://laturewak.tangwenfang.org/uploads/1/3/1/0/131071252/vutufop-nabuvam-vagusozigaz-sijolo.pdf
    • http://files.homeinspect.nz/uploads/1/3/0/7/130739204/mipapep-wikibexedanomix-vokurenexaz.pdf
    • http://files.blessmecreative.com/uploads/1/3/0/8/130814229/moviporet.pdf
    • http://files.iseeyouministry.com/uploads/1/3/0/7/130739415/vitoguwobaji_zurodonixofidan.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/dasudefuregenugezuwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/xoboxijinekonat.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/chevy_s10_5_speed_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/3994/files/kurig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/bacterias_anaerobias.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/joziwigevurewefotebutu.pdf
    • https://cdn.shopify.com/s/files/1/0444/3042/6278/files/metric_to_imperial_length_conversion_table.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/95616851883.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/52411589888.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_off00006bcc.bin
05dbc99d0197f4cb7335e1c4068ee9c2bfd942dc0cbc1593a31d5a513c96058c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 5556 bytes
font_01_sfnt_off00007ea1.bin
bfd9c90ff7896d2d4851f4666d3234ad9e866ce51c449831d9361c0343b68e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 10388 bytes

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