Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90a5de965340fb1…

MALICIOUS

PDF

39.4 KB Created: 2020-08-14 03:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97fbf8e9a29dbef87dd9b6bbc538ee98 SHA-1: 7f1961fd2932b0a2db1546c4fa7db79f1b09521a SHA-256: f90a5de965340fb18ab607c2a320923edc46f145d363ba03f86af34d3957ba06
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector to ttraff.cc, suggesting a link farm or phishing lure. The document body, though obfuscated, contains the text 'Free check register excel' and the malicious URL, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=free++check+register+excel
    • http://files.lewisandclarkdiscgolf.com/uploads/1/3/0/7/130775959/7302741.pdf
    • http://files.asiaklik.com/uploads/1/3/1/0/131071095/xosojosin.pdf
    • http://xoxopak.focacciafoods.com/uploads/1/3/2/6/132680839/8dca5ee.pdf
    • http://kabowipur.angelpractitioners.com/uploads/1/3/0/8/130874038/5634797.pdf
    • https://cdn.shopify.com/s/files/1/0437/2509/5062/files/87094800904.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/semuzemulimewobuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6949/files/1607166698.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/sonolipuburu.pdf
    • https://cdn.shopify.com/s/files/1/0446/6740/4451/files/tinuwijepujamosivibizetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/aids_biological_warfare.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/40876609836.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/30285225062.pdf
    • https://cdn.shopify.com/s/files/1/0435/2235/9447/files/bluebeam_tool_sets.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/85358913880.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_off00005dd8.bin
46f871054e6eb5d8ef83532028128339f6fa1b85792b11814b1cbc4cd9236125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 4940 bytes
font_01_sfnt_off00006ead.bin
d288c26a4e42bf5be9964f681dd151ffda2864e029f2c4844d0b3db384cecb58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAD 9992 bytes

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