Malicious PDF — malware analysis report

Static analysis result for SHA-256 9222675bb242cef4…

MALICIOUS

PDF

54.1 KB Created: 2020-08-01 14:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64097816f303667ef11c710470f4dd5 SHA-1: e8b2903de1c0ad9f6d3dcce447b1484bc1bfba34 SHA-256: 9222675bb242cef41792d0fd275268088cc18935e88fd7397adf8d2eb9990832
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 of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though heavily obfuscated, contains the same URL as the redirector, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=best+restaurants+in+charleston+wv
    • http://files.paulmmallory.com/uploads/1/3/0/7/130775108/nejoxebof-mujosad.pdf
    • http://files.nhpond.com/uploads/1/3/0/7/130774979/3625240.pdf
    • http://files.instantcarappraisal.com/uploads/1/3/1/1/131164462/waxigatusi.pdf
    • http://files.franklincommunityarts.co.nz/uploads/1/3/0/8/130874254/3690656.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/48669824166.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/1238016402.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/72240235844.pdf
    • https://cdn.shopify.com/s/files/1/0435/9304/0029/files/pepawonobilasupori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapiguwidekedod.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1671/files/tuxovubovojopefezule.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/darogokegasarune.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/bazuronav.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/80669708223.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/58795661092.pdf
    • https://cdn.shopify.com/s/files/1/0434/9313/0390/files/jukekidude.pdf
    • https://cdn.shopify.com/s/files/1/0432/6896/4505/files/dijeribuganapig.pdf
    • https://cdn.shopify.com/s/files/1/0434/1563/4071/files/pajufulovopasesunananimo.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_off000096c2.bin
28e63b1b8f01e58f2c3752d29eb88b2e7b61d5eda82c726862f02a54f5e58b05
pdf-font-stream PDF embedded font (sfnt) at offset 0x96C2 5088 bytes
font_01_sfnt_off0000a824.bin
c16b36bfa052e0a8d94c62e4f04115848fa3d916de95769bda0f0b17b2163851
pdf-font-stream PDF embedded font (sfnt) at offset 0xA824 10136 bytes