Malicious PDF — malware analysis report

Static analysis result for SHA-256 2191a8be75ca5bb0…

MALICIOUS

PDF

44.2 KB Created: 2020-08-10 03:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e9a850ab52bac61c0ef6104b679feb SHA-1: 8f4f9dcb2a3239eac2d06bcda4234bbf75c73aaf SHA-256: 2191a8be75ca5bb01f7d4f50c8fd6cbabc3dd9841099a157d7a2ef8245c003a0
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users to click on the embedded links. The ML classifier strongly supports the malicious nature of this PDF.

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=cavatina+piano+pdf
    • http://files.upwardboundcamp.org/uploads/1/3/1/3/131379923/rogovifomusitedone.pdf
    • http://files.koriprice.com/uploads/1/3/2/6/132695620/lebeduvo_mawoba_wiwujowe_buvivezep.pdf
    • http://files.bluntpencilprod.com/uploads/1/3/1/4/131438167/1390991.pdf
    • http://files.pagesustainability.com/uploads/1/3/1/4/131453061/xejow.pdf
    • https://cdn.shopify.com/s/files/1/0428/1335/8247/files/89954240755.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/xegedidasiganor.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/rapukexuroxiwixowadajinok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/pcr_rflp_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/benin_history.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/vululu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6630/files/joint_x_y_independent.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/8425698562.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/64868949705.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/sugatavopifimotadediwaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/gezironipazosadoburaja.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/cantoral_del_camino_neocatecumenal_en.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/8086_assembler_tutorial_for_beginners_part_2.pdf
    • https://cdn.shopify.com/s/files/1/0447/7770/1533/files/63800037386.pdf
    • https://cdn.shopify.com/s/files/1/0433/2254/0185/files/sevulovolupimilodig.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_off0000550c.bin
c079607688ae122aaa7928fcf0fd91f316e828b91a65f542a9b4892cc5e2554a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550C 4484 bytes
font_01_sfnt_off00006461.bin
1ba69504142e8ed799203bb7fa4eeb30bb140c39c2d59e27011ac3c226c1c56c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 15108 bytes
font_02_sfnt_off000093b7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93B7 4324 bytes

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