Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cabfbb142024b5…

MALICIOUS

PDF

43.5 KB Created: 2020-08-17 00:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d10b23e0bf98da6934f7cdf4ceb23e91 SHA-1: 3a8f252be29c9b937a456bf75d82326cee5ec896 SHA-256: a4cabfbb142024b5c8a137a04d7cf1630680340d101cbebf77b543b4fc486545
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'my autograph video songs free' and includes the suspicious URL, suggesting a lure to a malicious site. The presence of a large number of external PDF links further indicates a link farm, a common tactic for SEO poisoning or distributing 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=my+autograph+video+songs+free
    • http://files.scituateriltcc.org/uploads/1/3/1/8/131858540/f3bc8995de974ad.pdf
    • http://files.stefaniazissi.com/uploads/1/3/1/4/131407493/mimebidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/ruronel.pdf
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/jodavudedusulupoge.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/16097145570.pdf
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/vuzovifumubesefupokufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/75024112794.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/32470134623.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/54862809505.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/70236266777.pdf
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/zinekubesikepor.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_off00006a7a.bin
100453bd0765acff6d31a15a12d1393c8e65b13638030e1f1f8daace8ec99822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7A 5440 bytes
font_01_sfnt_off00007d0b.bin
9f757b9bedcab452d6996a81615ff1fa3928a0cfaa074fb31b358490f52239e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0B 11212 bytes

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