Malicious PDF — malware analysis report

Static analysis result for SHA-256 645029f69288ab58…

MALICIOUS

PDF

71.4 KB Created: 2020-08-13 21:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee5605e35fb951e9a94e4254cb5a1dc2 SHA-1: 82be50248ab3346c244fad5d82a28efe2ba2a2e4 SHA-256: 645029f69288ab587b5187611c2f712419a3a8bd9bcbaa56267f941516b3ee0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.com/pify?keyword=samouczek+angielski+dla+pocz%25C4%2585tkuj%25C4%2585cych+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating its likely purpose is to redirect users to malicious content. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of malicious intent.

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=samouczek+angielski+dla+pocz%25C4%2585tkuj%25C4%2585cych+pdf
    • http://files.sebianhealingcenter.com/uploads/1/3/0/7/130775953/7173065.pdf
    • http://files.k8mcc.com/uploads/1/3/1/3/131380895/a4f69e25a76f48c.pdf
    • http://files.balancefromwithinwellness.com/uploads/1/3/1/8/131856247/gabugidura_legaviguzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/xisuzovupujekej.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8822/files/22188652039.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8103/files/haryana_b._ed_merit_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/netherlands_flag_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/allahabad_state_university_time_table_2020_download_ma.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/types_of_cables_in_computer_network.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/xonukeputugifek.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/tudefijopebinetupuzof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/48330670926.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taselalodomojobuda.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/juxonadujazowosogijuvugi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1694/4796/files/59233002011.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b04d.bin
562f500272a45e059aa80fd2253ff0a40a4d7dce634dbdd8ccaf176b4832be07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 6024 bytes
font_01_sfnt_off0000c41e.bin
8540251aee941cbd1b74db9c549ba9011111c62d05a3e32974297991860bd531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 12336 bytes
font_02_sfnt_off0000eb10.bin
c72b90224a3819ecb4df95d23212449dcf7016745c7ee066fd85b325348d32e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 16064 bytes
font_03_sfnt_off0000ffb1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 4324 bytes

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