Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e66b686aaf82a6…

MALICIOUS

PDF

57.0 KB Created: 2020-07-27 16:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39718290e0211e01c2a5d64bf945b927 SHA-1: a6923005e4f0d3c70de452c7745e53576ba34610 SHA-256: 31e66b686aaf82a6338bd550f19ac5f7095e00c23d329efd09c5170f8a0a77fc
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to movie titles and application names, suggesting a lure. The primary attack pattern involves redirecting users to potentially harmful sites.

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=tamilrockers+attu+tamil+movie+hd
    • http://files.wcrc.info/uploads/1/3/2/7/132712268/gitikexefe.pdf
    • http://files.freetherobotcoffee.com/uploads/1/3/0/7/130740011/kebagamulari-sepesaj.pdf
    • http://files.riteinthewild.com/uploads/1/3/0/7/130739330/melusurinoxisawati.pdf
    • http://files.northgeorgiacern.org/uploads/1/3/2/6/132683135/5642180.pdf
    • http://files.krislagerband.com/uploads/1/3/1/3/131381605/kiwokubavure.pdf
    • http://files.krislagerband.com/uploads/1/3/1/3/131381605/kiwokubav
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/soxatogetet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/nedovokolimutiga.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/49317098487.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/19968779519.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/pemagojepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/zafumujetalogamopebazas.pdf
    • https://cdn.shopify.com/s/files/1/0436/7679/5030/files/fosowazagezomezubuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/30860788218.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/vavidaxafefuzijozub.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/wadazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/97601246886.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008117.bin
a09e61c0411410d29c5e94f1e8d0a76c85311e5d231c5d250a57e6f8cbd1ef67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8117 5028 bytes
font_01_sfnt_off00009229.bin
19d579821e83c32cd478aefcb57f849508ece8625c42f2108810477b29a00d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9229 1936 bytes
font_02_sfnt_off00009b6f.bin
a3f30ecb2cd34c6089532e3f5847970da7eaa56a0cb0880be016ae961dc6b0ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6F 10868 bytes
font_03_sfnt_off0000c0d7.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 16164 bytes

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