Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb71ae05457ad90c…

MALICIOUS

PDF

68.7 KB Created: 2020-08-19 10:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb6641e5fa8ea891d2e54f0a0e8e3626 SHA-1: 460ced651a487b02f554e38b9a46d805ed69b880 SHA-256: cb71ae05457ad90c5a626579a9ef8b9d6f2194b2a36e924e21d8dd21c693d653
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a job application form. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the visible redirect URL, indicating a social engineering lure to a malicious site.

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=jamaica+fire+brigade+job+application+form
    • http://gijak.millermiller.info/uploads/1/3/1/4/131437254/xipaxoxesivawev.pdf
    • http://files.spleitstrings.com/uploads/1/3/2/7/132740463/rikavavumojumes_logiximodinemi_daredolif.pdf
    • http://files.kinggeorgeadventures.com/uploads/1/3/0/7/130776490/nojuzupe-lipupe-fovawupoluduko.pdf
    • http://kozoxeb.rimcountrygoods.com/uploads/1/3/2/8/132814930/6744936.pdf
    • http://files.voicesandactionsforhaiti.com/uploads/1/3/0/8/130813357/4ef62e7b1c7f44.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/xedidixul.pdf
    • https://cdn.shopify.com/s/files/1/0436/7279/7337/files/historia_del_bienestar_laboral.pdf
    • https://cdn.shopify.com/s/files/1/0448/4133/6989/files/igcse_additional_mathematics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/asturias_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/16016101500.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5734/files/zebovusowaguv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/watching_free_movies_on_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5026/files/mastering_physics_answers_chapter_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/vakufetor.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/paravapukidaweru.pdf
    • https://cdn.shopify.com/s/files/1/0435/5745/3985/files/additions_to_esther.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_off0000b840.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB840 2828 bytes
font_01_sfnt_off0000c23a.bin
83ad752e04dc633e5e2a369a49030c1a0c7504c15b6835db77e530d424e223cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 5288 bytes
font_02_sfnt_off0000d417.bin
71ce94adf9a629542046ca2d5a4a2e693c6c6cc7dadb16758b7b754826e05330		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 10128 bytes
font_03_sfnt_off0000f6cb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 4324 bytes

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