Malicious PDF — malware analysis report

Static analysis result for SHA-256 1549d0d70ef00d62…

MALICIOUS

PDF

50.2 KB Created: 2020-08-14 16:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 893d04ada705fa5a3c094800b263ba2d SHA-1: 32b8db7ad618955a850d843499863ae68effc8e2 SHA-256: 1549d0d70ef00d629f0c8f229275e84b9bb66a452567f27c081ff8c4eb74a143
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise its true nature. No scripts were extracted, but the presence of a malicious redirector and a link farm indicates a likely phishing or SEO poisoning campaign.

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/pify?keyword=asymmetric+information+moral+hazard
    • http://files.alfflove.com/uploads/1/3/1/3/131397930/xatameb.pdf
    • http://files.en.yvesalizahno.com/uploads/1/3/1/4/131437689/sopotesikadebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/zinuvuvejazulowuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/91683203759.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/96561299975.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/rigosato.pdf
    • https://cdn.shopify.com/s/files/1/0437/3607/2341/files/jimapabagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/pakidodojodefatibu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9019/6133/files/vafexanamiwikabiduji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/87204841331.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/24328445754.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/jujigajesoposokemiroge.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_off00008784.bin
ca394b92244eb022795f9d961679b5b33989ebe2ce17e734fedcb2c535aba5be
pdf-font-stream PDF embedded font (sfnt) at offset 0x8784 5400 bytes
font_01_sfnt_off000099b8.bin
692b05bf64475a085a4eed538f90f611ea0b097855e46228776192c1ccd1da99
pdf-font-stream PDF embedded font (sfnt) at offset 0x99B8 10000 bytes