Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e884aae2c6010bd…

MALICIOUS

PDF

42.1 KB Created: 2020-08-03 04:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8fefd13c1b013abaf90297744c68493 SHA-1: 77a0ece0a316d3c3f0258e3608ca12b38cec3f54 SHA-256: 9e884aae2c6010bd4c008ad24ff3fb383c2773a715b796c824116b2ed7900fa0
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a large number of embedded links, many of which point to external PDF files. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=practical+music+theory+pdf'. The presence of a link farm and the ML classifier's high confidence score suggest this document is part of a campaign to distribute malicious content or manipulate search engine results.

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=practical+music+theory+pdf
    • http://files.widcombecraftfair.com/uploads/1/3/1/4/131406430/746220.pdf
    • http://files.wildwellnessllc.com/uploads/1/3/2/7/132740997/3245143.pdf
    • http://wodilawem.getwirelessnz.com/uploads/1/3/0/8/130814058/zuwoveligedej-kababemo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9660/2779/files/pivot_table_excel_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/35079635587.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/kobamavuwuxi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/rolling_stone_500_greatest_songs.pdf
    • https://cdn.shopify.com/s/files/1/0429/1297/2963/files/dekirerogozutejazekojodos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/34796896306.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/5262028021.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/ff12_license_board.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/60237091723.pdf
    • https://cdn.shopify.com/s/files/1/0440/5719/8757/files/42123514706.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/dynmap_config_folder.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/fizelobuxenemibanuber.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/21327129075.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/46218368011.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006559.bin
5bdbcdc7c24f06a1603bf053b6198802482b6df91631a76b1f793326e9cc82be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 5496 bytes
font_01_sfnt_off000077e5.bin
e3450cc288b329f4476b8e6129600385d8f04b2a113f001ca0d8e2ebb97751c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E5 10504 bytes

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