Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35d0112efc78102…

MALICIOUS

PDF

58.5 KB Created: 2020-08-13 23:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3cec71671c227e6d6eb56b386c5618e SHA-1: 8866863e7cd49ebb4fe1704673b4d5d3699ff2fa SHA-256: f35d0112efc78102a59b49a8b6d956736e431a3583ede57aa20f1160bcc7a7a8
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=calf+tear+rehabilitation+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure. The ML classifier strongly indicates maliciousness.

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=calf+tear+rehabilitation+pdf
    • http://files.sophalawyer.com/uploads/1/3/1/8/131857060/rulevolipubiw.pdf
    • http://files.bluelotushypno.com/uploads/1/3/1/3/131398547/vamusen-zuriga.pdf
    • http://futuwig.johnanthonyguitars.com/uploads/1/3/0/8/130874197/lejoruzubidamonu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/19722686778.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/kokogagalutuletufagok.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1148/files/98097539820.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/17569043098.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/susaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/43926922542.pdf
    • https://cdn.shopify.com/s/files/1/0432/7587/8564/files/basic_chemistry_review.pdf
    • https://cdn.shopify.com/s/files/1/0432/9730/8840/files/53163380188.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/24022371592.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1322/files/46266131895.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_off0000a8fd.bin
da20c5466e627bac0b1fd183256af8963e452457e1d6137c1101171c25e30598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FD 4996 bytes
font_01_sfnt_off0000b9e7.bin
258a92f61a0325a18c4c92b292e9fc9d7ff85eaf5bcd8f22b6b49d874871fdb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E7 10336 bytes

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