Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631e5a8234c202b…

MALICIOUS

PDF

38.2 KB Created: 2020-08-03 14:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b3420e48a1aa40e0f2e09fcea20c8e0 SHA-1: 9a5dcec42ac7cc4e61dca286b7bc3cd2430b3549 SHA-256: 6631e5a8234c202b657326dc2f32b8a0887db98f2d98bc640fc0e444b5520d51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=camberwell+assessment+of+need+forensic+version+pdf, which is known to host malicious content. The document body itself is largely unreadable, but the presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites.

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=camberwell+assessment+of+need+forensic+version+pdf
    • http://files.ukcamperhire.uk/uploads/1/3/2/6/132682303/4929cfc58f8.pdf
    • http://files.junepalmervividarc.org/uploads/1/3/1/4/131438456/jubuvebab.pdf
    • http://files.bltsnv.org/uploads/1/3/2/7/132740659/nefedofagubivoniza.pdf
    • http://files.customcrushfitness.com/uploads/1/3/1/4/131454521/lazovanuwejam-zuwugupulur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9103/2216/files/39850171869.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/vetifixerosafovesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pamuzinesikajojefex.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4229/files/21058371639.pdf
    • https://cdn.shopify.com/s/files/1/0431/2504/7463/files/49436866180.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/pofidowazigafat.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/patenamigupisaxege.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/vetapexonu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/79997759679.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/77695013740.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_off0000560d.bin
47e4a0b9c1f6048748b113c8ecf981c0ac54856db606a65a7351c75796651f91
pdf-font-stream PDF embedded font (sfnt) at offset 0x560D 5496 bytes
font_01_sfnt_off000068b9.bin
1c185107699c3701679ef86ea4d8c14b6426dbe33532aff147d15d186b448843
pdf-font-stream PDF embedded font (sfnt) at offset 0x68B9 10244 bytes