Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25f375c9b66bee1…

MALICIOUS

PDF

54.2 KB Created: 2020-07-30 10:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b3edf4369d9ba454e7b04057a2e637 SHA-1: 68b0d7f97126bc0d4cf7a36e093b582630e8990c SHA-256: b25f375c9b66bee11ed5308fd9d655381c1f831016c7a3dc3c888813a26bc00b
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, suggests a lure related to a statistics textbook solutions manual. The primary attack vector appears to be social engineering via a deceptive 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.cc/pify?keyword=understandable+statistics+10th+edition+solutions+manual+pdf
    • http://files.forestburgbaptist.org/uploads/1/3/1/0/131069899/8dd475a1420b.pdf
    • http://files.thebirdwatchermovie.com/uploads/1/3/1/4/131438604/nujow_zubabuximosegu_lijabubo_xidikuxagesud.pdf
    • http://files.rileyannsound.com/uploads/1/3/1/6/131637374/tusozag-wudaw-zepajusagid-xinaveba.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/zonijojoduku.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6140/files/miribevakib.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/6170905616.pdf
    • https://cdn.shopify.com/s/files/1/0430/9549/0721/files/gukomajexukatesuxuvoxikin.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/85875953036.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/1603106039.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/kusozozobegakej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/fejajeji.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/vabewurokokume.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/15138940828.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/wosani.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5871/files/zosoxiketosinavog.pdf
    • https://cdn.shopify.com/s/files/1/0438/9565/2504/files/77253362390.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_off000092e0.bin
64bff19f425b6a77e5bdfe26d78820430ab5917777893c01d3d440d63a5c1037		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E0 5604 bytes
font_01_sfnt_off0000a5b9.bin
76dacc8783edc666e054626e88cbc3a9ed15eb9b6024814ae1cd413fc42d78e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B9 10820 bytes

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