Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a4d7ab741dda6a…

MALICIOUS

PDF

32.2 KB Created: 2020-08-15 01:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23cd25dcd9ca829641b89c28b1eb218f SHA-1: 89c7fda1224c829f33e48c6b8903ad3a9a9c8f48 SHA-256: 89a4d7ab741dda6adf8f22e7af1e602689e25dd6f31e2259db05b48cb8d4b984
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary malicious redirector URL, indicating a phishing or scam attempt. The document body, though partially corrupted, suggests a lure related to aviation English teaching materials. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs points to a link farm strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=aviation+english+teacher%2527+s+book+pdf
    • http://files.capecodmedium.com/uploads/1/3/1/3/131379951/nagogopatatamu-zisadekobel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/14516189544.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/49554427824.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/bitavofonadaxefusebaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/1823/0688/files/54514072938.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/benjamin_franklin_biography_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/71373811731.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_off00004017.bin
2b216ccf786640012887d7744f053d72cf2a824844b3b6890a2a48731636e8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4017 5704 bytes
font_01_sfnt_off0000537e.bin
f28caebff8cb050a08ebcc274aec93cd6d074cb61bdda82d07d0df8b5d087e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x537E 9596 bytes

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