Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abd13c853242b35…

MALICIOUS

PDF

55.4 KB Created: 2020-08-09 22:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144ccf71e1e8875bb1280a0dd21ace0b SHA-1: 4947a9455415219025798ba9622b0641c3218f0d SHA-256: 8abd13c853242b3582abc37f75a2feafeb51e5619384f2a9d3ccafccc4cbfdd9
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains text related to 'stock market trend analysis pdf' and the URLs suggest a link farm intended to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of multiple embedded URLs points to a phishing or redirection scheme.

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=stock+market+trend+analysis+pdf
    • http://polapusom.amadeusandco.com/uploads/1/3/2/6/132681352/zomedemonuwisajuval.pdf
    • http://files.arlingtondfwchildcare.org/uploads/1/3/0/8/130814402/retasujifesolir.pdf
    • http://files.kimscpas.com/uploads/1/3/1/3/131379149/jazasanajimew.pdf
    • http://files.wongpakhangs.com/uploads/1/3/2/8/132815924/jifibebogetuginosusi.pdf
    • http://files.onenationveterans.com/uploads/1/3/2/6/132681861/zusosemevumatub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/thyroid_disease_in_pregnancy_rcog.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/how_to_make_tts_go_fast.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/dimisinosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/child_handwriting_font.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7816/files/calculus_spivak_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9065/files/61633551376.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/the_fox_1967.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/73325034293.pdf
    • https://cdn.shopify.com/s/files/1/0436/5526/6454/files/naromagojevoxibaze.pdf
    • https://cdn.shopify.com/s/files/1/0446/6599/5417/files/minolta_maxxum_7000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/region_based_segmentation_in_digital_image_processing.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_off000098be.bin
0e287920e6cc395123c97104491b11897f64ef4e3b3652a9ff5fba1aecd01bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BE 5568 bytes
font_01_sfnt_off0000abaa.bin
c880b973b788cff3f5467ee225f5a73ffce92013422da9653e724811991becc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABAA 10772 bytes

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