Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88a8b9ecad51748…

MALICIOUS

PDF

43.7 KB Created: 2020-07-31 02:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093c4667bbf827ccb2bbb4716300606e SHA-1: 84d75ff3a8dd09cb43bab8590c51bea1b217ff5d SHA-256: c88a8b9ecad51748762589723ffdbed3ab53f04b278846ea208faed70bf0280d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm, with numerous links hosted on Shopify, likely to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'new audit report pdf', aligning with the lure.

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=new+audit+report+pdf
    • http://files.smilingshelves.com/uploads/1/3/2/8/132814958/627ec86f0ed23b0.pdf
    • http://files.turtlewatch.info/uploads/1/3/1/4/131483006/1352477.pdf
    • http://files.jimkibler.net/uploads/1/3/2/6/132695258/basik_kexejapati.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/giwokabadeluseposa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62222626122.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/wamozesotepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4933/files/86685248830.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/megofurexumeparetekisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/luropepolobilejazaxavidor.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/wubotojusid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/dilinipixujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/papolodubebuzolefu.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/
    • https://cdn.shopify.com/s/files/1/0434/2949/4933/files/8668

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f7a.bin
4a2ffb66a75729fc6ed167c0954b5fbf1a6f3732a108cbaee0a4a49fbef96fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7A 4664 bytes
font_01_sfnt_off00007f7e.bin
59505cd01dd730538a928f92c5336cfdf783109087cf9c42b36e76b573fd8a25
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7E 10256 bytes