Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8799035ce2eb083…

MALICIOUS

PDF

47.6 KB Created: 2020-08-02 17:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4db9101015014e5523f499427478ead SHA-1: f9128e1a0703525e27e4214186327d2141e4a5db SHA-256: c8799035ce2eb083af9d5f0cbd6cdae80d5beec2a46dda6cc3fa11502ed53301
154 Risk Score

Malware Insights

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

The PDF contains a deceptive link presented as "Ap computer science 2016 free response answers" which redirects to a malicious URL (https://ttraff.cc/pify?keyword=ap+computer+science+2016+free+response+answers). The document also hosts a large number of external PDF links, many pointing to Shopify domains, likely as part of a link farm to improve search engine ranking for malicious content. No scripts were extracted, but the primary attack vector is the malicious redirector.

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=ap+computer+science+2016+free+response+answers
    • http://files.growlerlamp.com/uploads/1/3/1/4/131407445/1664686.pdf
    • http://files.pharmalauren.com/uploads/1/3/2/6/132696414/jiwul_vigeneba_sukolumekodave.pdf
    • http://files.mdddssolutions.com/uploads/1/3/1/3/131383953/gutatiris-lumot-jamufojotebo-duzobegagijaxet.pdf
    • http://files.advancedanaerobics.com/uploads/1/3/0/9/130969555/davam.pdf
    • http://files.commonwealthathletics.com/uploads/1/3/2/7/132740172/wedojofodevapen-moxib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/jiwulosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/83748519268.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/24879755499.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/short_sword_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/14281486055.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/butepaporutepuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8610/files/aws_security_blog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/rewizodoworagit.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/43630188116.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38030937597.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93336639176.pdf
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/98771319427.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/2429475773.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/vonaziz.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_off00006a9a.bin
2598936d29fe5e6c888ca0b4756c6e80bad6f01891e9be3c30c3163c014d2573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9A 5692 bytes
font_01_sfnt_off00007e00.bin
2d0f102c25070d8f729934c02655c22aaedbc69e0d28ebcc59272f23e98a593f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E00 15288 bytes

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