Malicious PDF — malware analysis report

Static analysis result for SHA-256 8394b769b27668d1…

MALICIOUS

PDF

36.5 KB Created: 2020-08-02 19:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86a488969507649e5831ba6cc249166 SHA-1: 2c1e652dca6c2d1abd9b851e77dd18814d52b9b7 SHA-256: 8394b769b27668d1a7ef1fbacf5db54acfdcec6fdd86e5946551fd3a694f8438
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=limewirw+for+mac'. This indicates the document's primary purpose is to redirect users to a malicious site, likely for phishing or malware distribution. The presence of a large number of external PDF links, many hosted on Shopify, further supports the SEO link farm tactic. No scripts were extracted, but the malicious redirector is the primary indicator of compromise.

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=limewirw+for+mac
    • http://files.clarkdehart.com/uploads/1/3/0/7/130776393/cc61a925a03.pdf
    • http://files.voutwelding.ca/uploads/1/3/1/4/131453917/0b4eb10baced1.pdf
    • http://files.merriemoore.com/uploads/1/3/1/3/131398367/liwunana.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/30813866268.pdf
    • https://cdn.shopify.com/s/files/1/0432/9016/5403/files/stardew_valley_lake_fish_bundle.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/mivinoxodugibaxotukasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0552/5661/files/nixurobezevenit.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/449486413.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/vobita.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/42035839086.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/11215438524.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/kotuwususapewa.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_off000051e6.bin
864fd2cc94499572e4a6bc216368dd2600f6418137379f87eaa3a4975b09c8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E6 4852 bytes
font_01_sfnt_off00006263.bin
6b9497af55393dfa59672b559367db8d7f39fec3e6e5e4b49e67f575b0c3b50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 10352 bytes

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