Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8a81737d9d42c0…

MALICIOUS

PDF

45.4 KB Created: 2020-08-24 22:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 282c29faf61223c5d55e6e77930c3cc2 SHA-1: 994e8d64f508ff6dd90ac5d590c0cb1896b7576a SHA-256: fd8a81737d9d42c0ef35457d36451b4e151c149c39a275816ed39e591d9a714b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a "Sat chemistry review guide". The ML classifier strongly indicates maliciousness. The PDF also hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO link farm abuse. The primary malicious URL is https://ttraff.com/pify?keyword=sat+chemistry+review+guide, which likely serves as a gateway to further malicious content.

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.com/pify?keyword=sat+chemistry+review+guide
    • http://files.twkdmsadvisory.com/uploads/1/3/2/3/132303269/79683f.pdf
    • http://vorabit.storeofhopeministries.com/uploads/1/3/1/4/131437363/2262997.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/33077575955.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/cardinal_and_intermediate_directions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/73953861707.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/jefafuvotadibupojepox.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/photoshop_brushes_pack.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/pewemonepaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/hazardous_area_classification_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/2709/5967/files/komofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/ralumazoruxawizaga.pdf
    • https://cdn.shopify.com/s/files/1/0448/4418/7805/files/maths_algebra_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/ff13-_2_endings_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pagujusevidunevaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4317/files/baganowaz.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_off0000728a.bin
0917a4c477773167768e09604efd955e8558ceedb07f54d220c74a8899853279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 5676 bytes
font_01_sfnt_off000085ba.bin
a5fc3ed9f8d9ac5d42a2b31c39abd0f062f97753962e89e3370e3db0b037bb74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BA 10228 bytes

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