Malicious PDF — malware analysis report

Static analysis result for SHA-256 216248619abf1e18…

MALICIOUS

PDF

48.5 KB Created: 2020-08-21 03:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 362dcc599ed023367560d97e5040cc3d SHA-1: f65aaf0593f8cde3280b646c415283d57c0f8729 SHA-256: 216248619abf1e185229380992c217e8f1496b4ccf7cbbe4f590f39369069e88
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector (ttraff.com). The document body text, though heavily obfuscated, contains keywords related to IELTS practice tests, suggesting a lure to trick users into clicking the malicious link. The PDF was flagged by multiple critical heuristics related to malicious redirectors and link farms.

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=graffiti+reading+answers+ielts+practice+test+6
    • http://files.mylifeaslj.com/uploads/1/3/0/8/130814169/dakobeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/24895083963.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/papowajobipafotaxirufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2886/files/fuluxaragivonabif.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/androcles_and_the_lion_play.pdf
    • https://cdn.shopify.com/s/files/1/0438/4292/8790/files/58549231537.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/zuziruxonelaroxexakirimew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofolevunukexus.pdf
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/fundamental_accounting_principles_23rd_edition_free.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/1/043

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e58.bin
2cdf904b89fa25406c5b6684d16af6ae7d6b74007b541859f7d229076f0bf018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E58 5600 bytes
font_01_sfnt_off00009189.bin
a916a319336a79bf5517e97d754fef74ad2d669074cf157886ad68e9ef130757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9189 10472 bytes

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