Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cec6bb94d593e3…

MALICIOUS

PDF

47.2 KB Created: 2020-08-25 16:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de18390748761818c2d07e8a125c645f SHA-1: 0d9ac6c239a15d9668d63d0edf39b9ef0998bc74 SHA-256: 91cec6bb94d593e3710881afa94955ae91bcdcb79deeb5efa887187ebd7f4e29
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as free PDF downloads, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other URLs hosted on suspicious domains, suggesting a phishing or malware distribution attempt.

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=blog+del+fotografo+pdf+gratis
    • http://files.shadysideofthetracks.com/uploads/1/3/0/7/130776822/d64a041bb35aa.pdf
    • http://files.hillsideumcgoffstown.org/uploads/1/3/2/7/132710795/a1883c79899ff5.pdf
    • http://xakegezir.cornerstreespreston.co.uk/uploads/1/3/1/4/131407469/xaperemawesiw.pdf
    • http://files.thehenrysplantfarmonline.com/uploads/1/3/2/8/132814930/fowuvitedafopan-jorapepawe-bazax.pdf
    • http://files.doubleeagledev.com/uploads/1/3/0/7/130776077/feledunaxafuba_sasulopojed_nesapezo_watobexojat.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/cadbury_sixth_form_college_term_dates.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/mcqs_of_computer_architecture_and_organization_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7991/files/new_general_mathematics_textbook_for_ss2.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/19764649592.pdf
    • https://cdn.shopify.com/s/files/1/0449/8151/8494/files/ps4_emulator_games_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3411/5233/files/laporovetuvopav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/82023587942.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/77325990887.pdf
    • https://cdn.shopify.com/s/files/1/0456/4448/0679/files/wibiditi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/buwim.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/blender_3d_tutorial_espaol.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_off00006472.bin
4a376cb2212f1bec23b4f7624f319f8751473b8dbfba47444aa86ff739fb1adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6472 5260 bytes
font_01_sfnt_off00007660.bin
213d2c5c819a596e34e4a46660abb6e1897712e8f64eded0cb56e1ad67cdb84d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 10892 bytes
font_02_sfnt_off000099e3.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E3 16312 bytes

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