Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bd82b11edc1474…

MALICIOUS

PDF

40.4 KB Created: 2020-08-22 13:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bac475f01893a1e688af638c564da5cf SHA-1: d6f7fa1bf66e055bf7e4d94febf0ccaa3bd71459 SHA-256: a4bd82b11edc1474e8d32c4f25687f653def3673043466adfc7691404529479d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to lure users to various sites. The ML classifier strongly supports the malicious nature of this document. No scripts were extracted, but the link farm and redirector are sufficient indicators of malicious intent.

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=a%2526+w+nutrition+menu+pdf
    • http://files.cottage11.com/uploads/1/3/0/7/130739449/wenagilatal-garuxene-dakumipotonifu-rabolexasi.pdf
    • http://besejul.dysoncommunications.com/uploads/1/3/2/6/132681352/1757132.pdf
    • http://files.hyggeorganic.com/uploads/1/3/1/8/131856491/tufowikejodam-jokej-wafigurawuxidod-kokelodiretalam.pdf
    • http://sogav.bayshorepharmacy.com/uploads/1/3/1/4/131437756/6258752.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9517/files/vectric_aspire_3d_clipart_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/how_to_use_although_in_a_sentence_correctly.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/60661787624.pdf
    • https://cdn.shopify.com/s/files/1/0432/2639/8888/files/brick_house_tavern_menu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/jobenebuwopefiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/zukikerazagid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/cengage_chemistry_jee_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/petefezutawenaz.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_off00006216.bin
9db9a7d477814922646c8148053e44eafd7815c005af5235e8707bb630d2c0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 4144 bytes
font_01_sfnt_off00007034.bin
f5e85cdda92532af0465c95d9878f9a3f1fd828e28f278422f0235055db351aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7034 11068 bytes

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