Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8e725f09441f69…

MALICIOUS

PDF

35.4 KB Created: 2020-08-22 08:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba96dab92936e5ea9103385d541a9ebf SHA-1: 46165b1a27f4ff7403ca18853a7d6bc5e6fc33db SHA-256: 8b8e725f09441f691e4a16b9357c5da20b6402b081ae94b5a32611cfae44ee90
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a worksheet and the malicious URL, suggesting a lure. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves redirecting the user to malicious infrastructure via a seemingly benign document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=prefix+and+suffix+worksheet+year+6
    • http://rovoxelig.splashsteamboat.org/uploads/1/3/1/4/131453526/fipesoja.pdf
    • http://nimolo.barefoottofino.com/uploads/1/3/2/7/132741009/8569925.pdf
    • http://kiwid.torquemetals.com/uploads/1/3/2/7/132711947/2983849.pdf
    • http://titabanu.drscollection.com/uploads/1/3/1/3/131380485/dazugavido.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/juruxavenusofo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/nurobififupu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/28587040718.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/mezobidepirazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musuvagexas.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/rijisomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/45372316815.pdf
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/lovujezezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/28869292941.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/galazivogunuro.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_off00004c4c.bin
05ef97d56661aa0793b19ec194746cab72b3d0f8212d23b8a3a194caa7b71b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4C 5444 bytes
font_01_sfnt_off00005ee4.bin
11d898f98073a26d41d6bd1070a12bb5a0791c39e85894f1059c1518b74bea1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE4 9948 bytes

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