Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5fc50a376aa8e6…

MALICIOUS

PDF

36.9 KB Created: 2020-08-22 15:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c78368e0ef2ebdf77cc47318c5379481 SHA-1: 9007e5f42138f74378a1eafd664dd53155da4b06 SHA-256: ae5fc50a376aa8e636540fd6db6a0043b600c4bbef6625cde1baf8fa97b1a891
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a social engineering attempt to redirect the user to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of the payload.

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=c+p+d+ka+full+form
    • http://teramer.assertion-evidence.com/uploads/1/3/0/7/130776483/3fba3a8640e068e.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4524/files/introduction_to_circuit_analysis_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/mice_and_mystics_lost_chapter_cat_s_cradle.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/talutekokefedabemubuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/xenenavegenawigod.pdf
    • https://cdn.shopify.com/s/files/1/0437/9400/6177/files/lunitumutixibo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/nosql_database_types.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/b_tech_civil_engineering_syllabus_2020.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_off0000544a.bin
e4ab79f28b4c9acd761a3d47f87803f3d59f67c11a3acb896a5259e6276e8746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x544A 4976 bytes
font_01_sfnt_off0000652b.bin
703a26bd93ad3c8e3c6eb6ad6687a259613876e8e35f986400f9ff8791195481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652B 10144 bytes

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