Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4bcebc27dc919f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-25 04:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c054cba63a339ad565fb30c3501c3238 SHA-1: 8ad3c074201fecdb28ea5940cce89b0394b1558d SHA-256: cf4bcebc27dc919f4e95a853e5e2aa5d6569948ed399f6b9dd1ff36a65449e18
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical redirector link to ttraff.ru, suggesting a link farm or phishing lure. The document body, though partially corrupted, contains text related to 'Itinéraire guide michelin suisse' and embedded URLs, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=itin%25C3%25A9raire+guide+michelin+suisse
    • http://files.petraphotographyart.com/uploads/1/3/0/8/130813913/lipufugi.pdf
    • http://files.guldbrikken.dk/uploads/1/3/1/4/131437225/pesumo_jiwonedo_nezukudomal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4072/6427/files/84764432841.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/77547458578.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/18577123227.pdf
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/attention_guitar_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0428/3315/0118/files/nojamasigizutizuxidox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0459/9260/7901/files/20254207879.pdf
    • https://cdn.shopify.com/s/files/1/0444/4487/6966/files/upsc_answer_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0440/8649/3349/files/free_21_day_keto_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/1716/7267/files/banting_recipes_compilation.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1700/files/oxford_tactics_for_listening_developing.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/xavejegenapuzewoteb.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_off000057f6.bin
6e0f3fcd8267678351a0c23a1147791d635b81d5807066eecfb4ebf6d60688a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F6 5432 bytes
font_01_sfnt_off000069ef.bin
b23a7b70e47ef2c193f73beb108a54b14c050fe96fc22838b3fca4c0fefc9001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EF 11684 bytes

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