Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdd02fbad5fbdad…

MALICIOUS

PDF

55.1 KB Created: 2020-08-09 03:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a27493b1cf2cede07fd4d93d6478604f SHA-1: c24975c0e8ee2105784350f90f3e65cddb51cd75 SHA-256: efdd02fbad5fbdad487fc4db710fe190e9146e9df08174cc7c2ab022159b25a1
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector (ttraff.ru), which is likely used to obscure the ultimate destination of the payload. The document body contains garbled text but also includes the same redirector URL, reinforcing its malicious intent. The presence of a large number of external links, many hosted on Shopify, suggests a link farm or SEO poisoning technique to distribute the malicious content.

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/pify?keyword=backpacking+recipes+pdf
    • http://kitub.blaznhotaustralianshepherds.com/uploads/1/3/2/7/132712358/2707564.pdf
    • http://files.unitedjudooftampa.org/uploads/1/3/1/0/131070231/63ff1d9059f.pdf
    • http://files.photosandfootnotes.com/uploads/1/3/0/7/130775934/rejumoropafixaxagol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sefumiwizekoreletete.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/warhammer_armies_bretonnia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/how_to_delete_commits_github.pdf
    • https://cdn.shopify.com/s/files/1/0433/2473/5643/files/76386049044.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/wupuxulujixib.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/mercury_smartcraft_gauges.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0431/2789/8268/files/49520909967.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/21051451506.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jivanup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000824f.bin
54c299304dee81662a0a94687b021eed62f39bb0bc9fbe492d0d80883c117c0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x824F 5000 bytes
font_01_sfnt_off0000934e.bin
c20a3ea56e87d05d4dfe5c3d9270332a5358c2e1bebdf21c6afefcfd6f95eedb
pdf-font-stream PDF embedded font (sfnt) at offset 0x934E 14580 bytes
font_02_sfnt_off0000c103.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 4324 bytes