Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23b888c642abb9d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-20 20:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be134fa2741010fabbae9e1b5348e5a1 SHA-1: 54e18acd92de41ec11e8f0cba8dc7003d3332acb SHA-256: a23b888c642abb9d8278156c4bb62cd20d69cb800a38d72852f30dfae4eb1f8d
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=bicycle+thieves+malayalam+songs+free'. The document body, though partially corrupted, also contains this URL and other links, suggesting a link farm or redirection strategy to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bicycle+thieves+malayalam+songs+free
    • http://files.maladattaphd.com/uploads/1/3/2/3/132303123/7863678.pdf
    • http://files.obacuisine.com/uploads/1/3/1/6/131636737/mowamejegumup.pdf
    • http://supuma.sutureconcepts.com/uploads/1/3/2/6/132683014/7465941.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/jejemokeli.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/noderarugese.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/panijesitu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/rubabujedadozumigon.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/fiwerodoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/woxirefivunidudisijad.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/speaking_the_truth_in_love.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/nes_emulator_windows.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/twin_xlong_fitted_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/jatabuzewawemuluzoraku.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/7_days_to_die_cobblestone_frame.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5840/files/40402414003.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_off00005a93.bin
516f21e1ce4e7f9ca371e2d99089f038dd3a2c27c95691c62f07809951dec0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A93 5292 bytes
font_01_sfnt_off00006c6f.bin
cc1b0c97c7c40b629e57a9ecc047873c4cc0a6f3dd33220eea329884b74a096a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6F 11136 bytes
font_02_sfnt_off00009248.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9248 4324 bytes