Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5561b0fd59641ec…

MALICIOUS

PDF

44.1 KB Created: 2020-08-03 15:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028d7fb10c71ff68017232657e29d8a8 SHA-1: b4560141a24fa31eb319b3d3a9d59ea13fc5cb0f SHA-256: a5561b0fd59641ec70aab5a35682a63d679c7354672eaad53c49b1ecef9ed6ca
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or redirection strategy to lead users to malicious content. The primary malicious URL identified is https://ttraff.ru/wb?keyword=taksonomi%20kacang%20kedelai%20pdf.

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/wb?keyword=taksonomi%20kacang%20kedelai%20pdf
    • http://files.fireflytoysandgames.com/uploads/1/3/2/7/132740371/d026fa9fa.pdf
    • http://files.shannonmcferrinfineartist.com/uploads/1/3/1/4/131438013/liwozikapewusotojov.pdf
    • http://files.demigodlodge.org/uploads/1/3/1/3/131380107/2311125.pdf
    • http://files.mymodernsolutions.ca/uploads/1/3/0/8/130873804/jiperenezo-fixogogezivile-welev-fudiledomuv.pdf
    • http://files.andrewastanley.com/uploads/1/3/1/6/131636914/libigekeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/4469299618.pdf
    • https://cdn.shopify.com/s/files/1/0434/3968/5799/files/webelo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3415/5928/files/91319975516.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/59433216312.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/73050552009.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/numulodoriwezaninarez.pdf
    • https://cdn.shopify.com/s/files/1/0429/6310/8003/files/zudinowuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/kovizoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2093/4558/files/12889181637.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/14525783740.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/78051108849.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_off00006f74.bin
71b5b53c3e9b319b85fd1e455c0816de69ff242b79a46126605df5b919993fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F74 5392 bytes
font_01_sfnt_off000081c4.bin
cf985d847a957587079d535f3c849d7342621107d8332362e95779ed351d8520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C4 9928 bytes

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