Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c638f283f0121b5…

MALICIOUS

PDF

44.4 KB Created: 2020-08-04 23:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 513092ecff37fe17450c251cefd98692 SHA-1: 81d85f3c368752bdc211b3cff7a14fa4f4465a9d SHA-256: 6c638f283f0121b529b1d83594560f86515bbb7858137dfc010e9b8befb8f80c
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign Shopify domains, but one critical link redirects to a known malicious infrastructure at ttraff.ru. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The presence of a download button lure further supports the intent to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=mg+university+bsc+psychology+syllabus+pdf
    • http://files.lauraavnaim.com/uploads/1/3/0/9/130969819/0ec2ee5.pdf
    • http://files.drifftblog.com/uploads/1/3/0/7/130739810/5636490.pdf
    • http://files.realestate-investment-australia.com/uploads/1/3/0/8/130813961/1286042.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/72956860088.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/85468594219.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/67311475375.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/salon.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/43760158966.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/38511910091.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/60874816064.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89186344985.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/sumizimegugeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67062005494.pdf
    • https://cdn.shopify.com/s/files/1/0432/7748/4196/files/managerial_economics_paul_keat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/kindergarten_addition_and_subtraction_worksheets.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_off00006eaa.bin
b623beffd65fbbba4a122abe5c99a905bf6a094fb6e9bce0d562e30576a4e6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAA 5724 bytes
font_01_sfnt_off00008241.bin
a88db674f8f9d11765bad18e57d4861d764fda9abc99faee350a5390c67fa4ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8241 10048 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.