Malicious PDF — malware analysis report

Static analysis result for SHA-256 68db0690549f66c7…

MALICIOUS

PDF

63.8 KB Created: 2020-08-02 08:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c71e22ea9c511093c04ae0622d9400d SHA-1: b27dd86d16b483b9de2b7cccf4ef4326a0b9eaf5 SHA-256: 68db0690549f66c7f773717ac9e004787664c664423d9734136c99ed19bd7eaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that point to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text that appears to be a book title, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=serway+faughn+college+physics+7th+edition+pdf
    • http://files.yesternoir.org/uploads/1/3/1/4/131483031/50c050.pdf
    • http://files.bethgabow.com/uploads/1/3/2/6/132682731/3318084.pdf
    • http://files.mazeaudio.com/uploads/1/3/2/7/132740997/mejif_nidotezi_femovidapok_xanejavifuwafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/subnautica_table_coral.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/zagilu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/73139340811.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/lebibig.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5199/files/25583901102.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/wewilozimojes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4181/files/kazugitobotulategenaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3082/2555/files/vuxuzuxaxam.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/98974113475.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/pizewuvewasat.pdf
    • https://cdn.shopify.com/s/files/1/0433/1841/1417/files/kifabewilepikujuxakov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/jugejizuwusesujonuda.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b02c.bin
79ab26ccf092f27a378f2200b62dece1de1aac626b852d9195dd71fef3aff184
pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 5792 bytes
font_01_sfnt_off0000c401.bin
2b913485ff91a267375a42447f202ca00c29dc6371d7cf504f28ccedf83bbf91
pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 14528 bytes