Malicious PDF — malware analysis report

Static analysis result for SHA-256 84598b4e568dc9a5…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 05:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daff5428bdd7baf8dea7dd7735fa3e8d SHA-1: e60306df18453e8585faf42f483b0ca905895b64 SHA-256: 84598b4e568dc9a5cb6fd94952b8ccdadf1f6f3be3314c68d7a72f583f5268ef
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=annual+credit+report+australia'. Another heuristic detected a link farm hosted on Shopify, with many links pointing to PDF files. The document body contains garbled text but includes the malicious redirector URL. The primary attack pattern appears to be a lure for a scam, leveraging a link farm to obscure the malicious destination.

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=annual+credit+report+australia
    • http://files.winchad.com/uploads/1/3/1/4/131406365/ronufesipedawis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1001/5910/files/76398556172.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/najojeva.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7551/files/nagizidamitarimumufap.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/38760081658.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/indefinite_articles_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/death_metal_logos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/algebra_tiles_activities.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/kudikisiporu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5026/0890/files/oresteia_robert_fagles.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/bitove.pdf
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/tutorialspoint_angular_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8600/files/dozejinojeriro.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/80923819236.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_off00005c01.bin
370c3cae91ea786149e5d16e9679eabe5d06320d9375dcf72688175c0a18fbad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C01 4940 bytes
font_01_sfnt_off00006cbd.bin
3e4ce4bcdaeeea8c1344a7e895f40468c48794474412b49ddde91e89b0426137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 9856 bytes
font_02_sfnt_off00008e4d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4D 4324 bytes

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