Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef370236e756cdf…

MALICIOUS

PDF

36.9 KB Created: 2020-08-10 13:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda110f59fb1e201cf213f9edeb383c5 SHA-1: 524bb2825100010318a8d94d17178aaedf8e3dd6 SHA-256: 3ef370236e756cdf766a0a462d5ea8ba3242f7448bdb0afa18eba1fe445ab019
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body and embedded URLs suggest a lure for a PDF download, likely to manipulate search engine results or redirect users to malicious content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=mrutyunjay+kadambari+pdf+download, which is flagged as a redirector. 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.cc/pify?keyword=mrutyunjay+kadambari+pdf+download
    • http://wavuvavo.ammehealthcorp.org/uploads/1/3/1/3/131383483/9cd3542.pdf
    • http://files.iknowpavers.com/uploads/1/3/1/4/131438067/9465553.pdf
    • http://files.fordingbridgebc.com/uploads/1/3/1/4/131452861/3958376.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/gudadikitarobefex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9639/2348/files/ned_s_declassified_school_survival_guide_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/libro_automatismos_industriales_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/97856151536.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/gace_math_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/calculus_textbook_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/81583660287.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/wajote.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/72718420646.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/synonyms_antonyms_list_competitive_exams.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/71817890162.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046cc.bin
0424dd9972cacdbf7460bd73665a85c39f321a96a691fb1666e8f4982dfda918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46CC 5252 bytes
font_01_sfnt_off000058a2.bin
856c2c0137e8b7a39c1a7f3d7c85c8ff06bf9f6e21881083c860e3cc3fb81719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A2 9332 bytes
font_02_sfnt_off00007882.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7882 4324 bytes

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