Malicious PDF — malware analysis report

Static analysis result for SHA-256 8036353a614af207…

MALICIOUS

PDF

46.0 KB Created: 2020-08-26 08:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f8c8bcb2744ee20d55965cbd5920e52 SHA-1: 61a98008d8e625a96552a51f1fcac60e575475ce SHA-256: 8036353a614af2076d70450d3f5ca8980eadb2c845078887b0404f66ece1fbc7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'free math workbook pdf' and includes the malicious URL. This suggests a phishing or social engineering attack aiming to redirect users to harmful 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.me/pify?keyword=free+math+workbook+pdf
    • http://vutug.eyebelieveeyecan.com/uploads/1/3/1/4/131437254/xusobowim.pdf
    • http://sevaxixu.coachesathletic.com/uploads/1/3/2/3/132303382/potitifid_dikixemili.pdf
    • http://files.rosmanith-mclean.com/uploads/1/3/0/8/130874090/d6d587753de6fc.pdf
    • http://files.fimc.info/uploads/1/3/1/6/131606526/wetejavukosuna.pdf
    • http://files.skzlandscaping.com/uploads/1/3/2/7/132740525/kipafalige.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/rupizikenezusenekos.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/francis_bacon_advancement_of_learning.pdf
    • https://cdn.shopify.com/s/files/1/0464/7138/1160/files/taxurifito.pdf
    • https://cdn.shopify.com/s/files/1/0444/3960/1318/files/seguwapeboxipomo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/76486605307.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/kavegiroguguxizubuma.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4108/files/mowebesajenowolutideririv.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/sizutolubabu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/xidakijekorasoxusaz.pdf
    • https://cdn.shopify.com/s/files/1/0461/0238/0708/files/laryngeal_cancer_guidelines_nccn.pdf
    • https://cdn.shopify.com/s/files/1/0452/8907/8946/files/niwibopinedoxorikavalodoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/bivaxasototijokoxam.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_off00006737.bin
7d7081e1e81239852619cf5d432ccec496438642d88b1cb41cceb3bb3a3e2fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6737 4956 bytes
font_01_sfnt_off00007819.bin
5ed62b5802fccd516d6cdcecdcbd0408d16f37d3ec7759387b60a45b9f7c5784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7819 10704 bytes
font_02_sfnt_off00009cb1.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB1 4324 bytes

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