Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb152c24df67f0c…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 05:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1585eaf9120a115bdc919048d83a7f4 SHA-1: a703a40ef32c5303af3e73a9ee071e2032f54f1a SHA-256: ddb152c24df67f0c627ae3311c859b412c8bfe617a5192769769ee24575973aa
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'https://ttraff.cc/wix?keyword=ce+certification+full+form', disguised as a search result. The document body also contains numerous links to external PDFs, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The ML classifier 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.cc/wix?keyword=ce+certification+full+form
    • https://static.usrfiles.com/ugd/b80405_7cd83578c1894412a2b1c9a17487a898.pdf
    • https://static.usrfiles.com/ugd/33ab24_9665c5d93eae41e6a59c7ee7ca336ddd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0c235dfc35946d0a1b74cd1f9022525.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/talekosutosa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0286/1464/files/wevipov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/11146800471.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/fovalozalufokapadogepema.pdf
    • https://static.usrfiles.com/ugd/e02969_086c365585fd4a1ca14aeffa095235ce.pdf
    • https://static.usrfiles.com/ugd/eb6612_e274446c3ce94118ba8c68618fbcb8f9.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4103/files/27679783770.pdf
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/1593364405.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/zones_of_regulation_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/pexovovawa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/sudalinasirirezogoz.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_off00006665.bin
e4be1c773c77ca97f5bd21fddf985bb8d7c8b3c2c1c2eb448cb1a6a5fe461cfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6665 4752 bytes
font_01_sfnt_off00007679.bin
3fedbc6394c90b2276d761aa323f72f4815bca43775bdd9fef04023d73b3d4ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7679 10120 bytes