Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04cf6892a3d6682…

MALICIOUS

PDF

46.9 KB Created: 2020-08-12 13:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23eba9d031809793e5abfe3326eae5d0 SHA-1: d7d5e11180c6b8118e02d7bb206969c6912efd21 SHA-256: c04cf6892a3d6682e29a7bdd45e8b34acbca1bad4bb7762066c626e6db625c79
154 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'tamil news paper pdf download' and the malicious URL, suggesting a lure for users seeking content. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or content-scraping attempt.

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.ru/pify?keyword=all+tamil+news+paper+pdf+download
    • http://files.cheerproathletics.com/uploads/1/3/1/4/131407274/9305155.pdf
    • http://files.abuseresourcenetwork.org/uploads/1/3/0/7/130738596/1870859.pdf
    • http://darifivof.jennifermagid.com/uploads/1/3/0/8/130814769/tetujod-xivosaw.pdf
    • http://files.nabesphotos.com/uploads/1/3/0/8/130813510/nufejo-golad-punijiporex.pdf
    • http://files.campmiller.com/uploads/1/3/1/4/131406222/ca9dc26c.pdf
    • https://cdn.shopify.com/s/files/1/0432/7954/8574/files/xixofenokajelujatotof.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/amdal_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/dufumutexirozikuwiriwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/21360187738.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1964/files/wejumajizogarox.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/xuram.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/66595688023.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/wwe_smackdown_theme_songs.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/english_grammar_exercise_for_beginners.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/
    • https://cdn.shopify.com/s/files/1/0433/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005426.bin
8e5f0b9184e666d39e727e09193ed3327955b4e44396731b4b0add1662b99d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5426 5268 bytes
font_01_sfnt_off00006605.bin
606157225d4ff6436cd578acf3617b25f5851e3bb57590fb0e89a802a6c5437a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 4220 bytes
font_02_sfnt_off00007438.bin
09ea4c4bb2d9c754c0bb74ac687112127be7c5b7fa5902f249bb635b7e65c16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7438 10516 bytes
font_03_sfnt_off00009867.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9867 16164 bytes

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