Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d01235e28623df…

MALICIOUS

PDF

78.7 KB Created: 2020-08-06 04:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00551dee9b7a8e5f1fdf0dd5edb6cdb SHA-1: e3c99635e5a8bd519f77cd7b2c0b1c927f7392ec SHA-256: e6d01235e28623df4d1c018f4edcb0470cf28585b35c661fab21b589d6dfd289
154 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 a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector, and another indicated a large external PDF link farm. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm, suggesting a social engineering lure to drive traffic to malicious infrastructure.

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.ru/pify?keyword=guida+turistica+bilbao+pdf
    • http://files.lymeaustralia.com/uploads/1/3/1/6/131606284/2801022.pdf
    • http://files.pointepoa.org/uploads/1/3/2/6/132696483/kumirazowoga_momamedarofem_sumufiwedoresan_fatoxijupeziv.pdf
    • http://files.battambangparish.org/uploads/1/3/2/6/132681002/d767baf407e6.pdf
    • http://files.donbryant.com/uploads/1/3/1/3/131379820/4546952.pdf
    • http://files.besomeoneco.com/uploads/1/3/0/7/130775516/fikavasufiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/dojunisabarepogapizaxula.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/rudizofib.pdf
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/bfuhs_holiday_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/5804/3797/files/sell_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/98641118693.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/felifelubefavazu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/bacteriophages_biology_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/venolawimula.pdf
    • https://cdn.shopify.com/s/files/1/0434/4401/1168/files/50845350286.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7360/files/bee_movie_in_1_second.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/tugukukemojinewin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce16.bin
e32824f8bc56d25b23f453145a2a41d3880565b44aebfa0c0ff182b49e92989d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 4980 bytes
font_01_sfnt_off0000df0a.bin
6b56d482db30445c3df096b2e88c27280bf584d52da4adfbb0d55e732d50412d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 12048 bytes
font_02_sfnt_off00010671.bin
69cb347ec9cf8b230d14d772cffdf90406b941589bd873d85c76c66c47458d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 16876 bytes
font_03_sfnt_off00011dad.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 4324 bytes

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