Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cfddffe8650d20…

MALICIOUS

PDF

38.9 KB Created: 2020-08-05 18:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9db87f559c653f2ca172e43466918f54 SHA-1: 769d7eeea5189ddab327869ab633537f9ae637b3 SHA-256: 86cfddffe8650d2021dfd1438947d8ab8ac6d01d85b3423b7cf337c51c0f0b31
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.com' is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'adverbs of frequency questions exercises pdf', suggesting a lure to disguise the malicious intent. The presence of a malicious redirector indicates the document is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=adverbs+of+frequency+questions+exercises+pdf
    • http://files.multistrands.com/uploads/1/3/1/1/131163872/971dc6d529dbf0.pdf
    • http://files.margiekorrison.com/uploads/1/3/0/8/130813899/8286774.pdf
    • http://files.thorntonheathcricket.co.uk/uploads/1/3/1/4/131453194/3059726.pdf
    • http://files.avmheartlandchapter.com/uploads/1/3/0/7/130775387/5636789.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/dubobelikobowi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/gepum.pdf
    • https://cdn.shopify.com/s/files/1/0435/8357/0078/files/unity_get_all_children.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/73261144720.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/napidago.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/rawenugudubezupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/83468707348.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/88992252561.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/22729871768.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mabiwabupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3557/files/self_adjoint_operator.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/76720513774.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/calculus_1_exam.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_off00005936.bin
4301617f7938ab43076f7a9a6d14f0b8c94365e0d3b651154a0bb2c26e25f74b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5936 5392 bytes
font_01_sfnt_off00006ba7.bin
fcad98f964cb897aeb6f3684d03b604885a9f55aa5cab3adfe5c25aee90d0143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 10288 bytes

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