Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc71b2b474f81a7e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-31 15:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c03b8701de3cb3123486203988f3f83d SHA-1: c558368a0741a76c5fa3e7b217e41c88bb695da6 SHA-256: fc71b2b474f81a7eee981064e0956c63ad10bbe71b5277966bd00c1ca20aba69
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL, 'https://ttraff.ru/wix?keyword=advantages+of+systematic+sampling+pdf', is likely part of an SEO poisoning campaign to lure unsuspecting users. The document body, though heavily obfuscated, contains text related to systematic sampling and the wkhtmltopdf tool, suggesting a pretext for the malicious links. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=advantages+of+systematic+sampling+pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97503793953.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/63077638008.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/zoology_miller_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/82765881253.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/3572911914.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/train_time_table_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7207/files/subtracting_dissimilar_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/rumiparugiforudanazif.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/dnd_5e_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/98470768405.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_off00006762.bin
5ae92b81369860169a49e280eaa280ef9f5c063c3d780d333bd972e8c8fd509b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6762 5528 bytes
font_01_sfnt_off00007a3f.bin
866e16b88e4fed34d7d5e57b68910f09c0bb69d4708a750b458b8b893ba8cc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3F 9980 bytes

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