Malicious PDF — malware analysis report

Static analysis result for SHA-256 724db1e35e99cbe1…

MALICIOUS

PDF

47.9 KB Created: 2020-09-07 05:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fe169959c23c36f0f8ba8c92117a3e7 SHA-1: 3b8e42c64a754bc0178d32196bb029c2b90c66a4 SHA-256: 724db1e35e99cbe1f22c1225ec87219cdc83e1c1eef090f063ab0915db05d83a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'solution manual' and includes the malicious URL, indicating a lure for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=intermediate+accounting+solution+manual+chapter+8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/discord_role_ideas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/bipobiroguri.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/facebook_profile_frame_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/46280621397.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/zelogewif.pdf
    • https://static.usrfiles.com/ugd/5ecadc_8a0c65bc902c40c591cff36de658c2d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_854749b94cf34baca9ab932ae6fd90a9.pdf
    • https://static.usrfiles.com/ugd/c88839_06fcffd8a5ff416ca8e1ddee4ecdc186.pdf
    • https://static.usrfiles.com/ugd/6290de_21ad41ad0b5142b68f010b254b4c42e4.pdf
    • https://static.usrfiles.com/ugd/97aff7_d636a1f0e5bc4c82a621d7d6a001f3da.pdf
    • https://static.usrfiles.com/ugd/e1a791_26744c0b5ddb43a1aed288b048c37cde.pdf
    • https://static.usrfiles.com/ugd/affb4a_8cb6036f72b348bcb3d6aa54b78ca10c.pdf
    • https://static.usrfiles.com/ugd/96564c_a4aa58b722d24495b6f2a7f8b6e68e23.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_d08fd43ef86c404394781ea01f3c2f75.pdf
    • https://static.usrfiles.com/ugd/4d935e_acc479410e54428fb0957804bcce39d4.pdf
    • https://static.usrfiles.com/ugd/a474dd_d8c790ca6ae2429abea921a6c5ea668e.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_off00006f68.bin
cf02a5f3db9375b677ba752d066da972c6dea115042c775e6e4c4f6edcc4a2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F68 5616 bytes
font_01_sfnt_off0000824a.bin
0be7f35622c8de6b722fbd6780c821c2cd7e509b2ade3e039c00ccc771c691c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x824A 14836 bytes

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