Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a9e29177f63112…

MALICIOUS

PDF

38.4 KB Created: 2020-08-30 22:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a9a7b1768a4e6432ac015c6041f0d66 SHA-1: 6fc08d9d389084ba70f5c4ffab02387d813636db SHA-256: c6a9e29177f631126bcb2a4744771d84d3802dc85b11fb8b5f7f785b4e457884
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, appears to contain the same URL and references a worksheet, suggesting a social engineering pretext. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=intersecting+parallel+lines+worksheet
    • https://static.usrfiles.com/ugd/067ecb_324870bcf68d4fb8bf4214f2e87d04c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ed621cae4ff4374b95ba5c56f3b0acf.pdf
    • https://static.usrfiles.com/ugd/a2e20a_fe63c3422d2d4abc9f1c02611e0346b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f4329fbca514f19b89026caab24482f.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7818/files/pyspark_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/73447237430.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/convert_cdf_to_python.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/eminem_recovery_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/gawoxasijukifarewawilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/28717700882.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6541/files/alvin_and_the_chipmunks_3_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/angulos_inscritos_en_una_circunferencia_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0433/7467/4083/files/85595782651.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1362/files/sofonuxegeguj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/19205064926.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_off00005913.bin
d6b5e902eee4998a563092716f9eda0cae75611b0c1a163bd9d786558088bd21
pdf-font-stream PDF embedded font (sfnt) at offset 0x5913 5288 bytes
font_01_sfnt_off00006b1a.bin
fb630398a446da6dc0112ea37024919c8093f7f0bfaadfd4b045d45105ca375f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1A 9792 bytes