Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4aab13d70af35ed…

MALICIOUS

PDF

33.0 KB Created: 2020-08-04 03:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5837c50cf2c400ce24bcd2509f7ae22 SHA-1: 15e70694431d5f542be597f4d93a8d78e046ea12 SHA-256: f4aab13d70af35edc0cbdefc2849e1b1bf481479f3c5d39e0557e79c863e4c77
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector at 'https://ttraff.com/pify?keyword=adding+fractions+tarsia+pdf'. This suggests a link farm or SEO poisoning tactic to disguise malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.com/pify?keyword=adding+fractions+tarsia+pdf
    • http://bezuxu.yorkunidarts.com/uploads/1/3/1/0/131070590/famirewi.pdf
    • http://files.theitinerantoaf.com/uploads/1/3/1/8/131871717/laximuv-dopibupoxo-jigoborutixolon-xugerijeluzis.pdf
    • http://files.write-the-vision.com/uploads/1/3/1/3/131380847/tatexapija-pisisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/99281324594.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/89247282502.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/11301206199.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/begemibugobar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/masodinafiminuniwololode.pdf
    • https://cdn.shopify.com/s/files/1/0434/8900/1638/files/51399859310.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/watopokedexupanulorag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/4chan_serial_killer.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/purebdcraft_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/tigamadi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/71055586902.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_off00004643.bin
d46d15b50aca4c5ff3a96825ecc0786ceb3e4ba831c1d03ad6f9418458e6023f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4643 5280 bytes
font_01_sfnt_off00005852.bin
b3aca68b3cba27d37260857e81aa04246ea0a7981fb036abffdd82a2de7deac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5852 9060 bytes

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