Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43272ce9546100c…

MALICIOUS

PDF

47.8 KB Created: 2020-08-03 01:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee50e8d913883f93ca62538dbc76d34a SHA-1: f113bd7ffee1c5bfa19b219511a362d7514b6613 SHA-256: c43272ce9546100ce525cc9b91b78315ed03b1f40acfcdb401860479a1054ba8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=white+cat+osu'. Additionally, it exhibits a PDF link farm behavior, with numerous links hosted on cdn.shopify.com, one of which is 'https://cdn.shopify.com/s/files/1/0429/3623/8236/files/59015444840.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirect URL, suggesting a lure to external 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=white+cat+osu
    • http://files.bellamcbride.ca/uploads/1/3/0/7/130776152/lamapusiv.pdf
    • http://files.jojoknits.com/uploads/1/3/0/7/130739971/titoxuzariv_nilujeg_rebezo_lijad.pdf
    • http://files.pack84mv.org/uploads/1/3/1/4/131406722/migupuliwani_rolira.pdf
    • http://files.centurycentralteamroping.com/uploads/1/3/1/1/131163986/5122525.pdf
    • http://files.jojoknit
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/59015444840.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/20880404741.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/5495689099.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/tai_chi_24_form_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/bododilatutugotekikol.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/dekalatisaroxusejepatep.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4422/files/84392773821.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/64589830875.pdf
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/14298321506.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/88647519764.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007295.bin
00cde46032ee9c6a942f2060411954537a3ca687b2f8802067137d6d8652e452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7295 4548 bytes
font_01_sfnt_off0000821b.bin
4e17f7714b833b1b970abca1e650323af793b0eb24666684ee4d04be51777691		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821B 10044 bytes
font_02_sfnt_off0000a479.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA479 4324 bytes

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