Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb406cbf46c4607…

MALICIOUS

PDF

49.4 KB Created: 2020-08-28 12:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcb5804e88fe565769d06f51a4a7eb6a SHA-1: c9a656ca5f06a07f26760d1005f4a7b66b3f8a51 SHA-256: 8cb406cbf46c460774b27f3240effe4e07356e9c56eafdf11f16a15860a755ea
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a large number of external links, a technique often used to distribute malware or lead users to phishing pages. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=el+cucumi+se+despierta+los+domingos', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=el+cucumi+se+despierta+los+domingos
    • http://zoguzew.redneckfest.org/uploads/1/3/1/4/131437402/2294523.pdf
    • https://cdn.shopify.com/s/files/1/0439/2130/9851/files/67435225806.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/39729485573.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/centum_vp_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rakapadanixip.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/juvirojodeluvajesokikof.pdf
    • https://cdn.shopify.com/s/files/1/0431/0184/7708/files/pujefanazegener.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/javier_villalobos_martin.pdf
    • https://cdn.shopify.com/s/files/1/0440/5205/4181/files/agriculture_colleges_in_ap_list.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/31900596635.pdf
    • https://cdn.shopify.com/s/files/1/0454/3309/4312/files/25734246741.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/bedolunumudatebukis.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_off00007403.bin
72a4e4e42f3032373f856e99b6b0c56c8975b626b7f49424132d107f4e3841e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7403 5232 bytes
font_01_sfnt_off000085b2.bin
bc445d4a2e45b7f6f6a471b0f3c132b346ccfa436604b86fc9a5ae6c4d9613b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B2 11616 bytes
font_02_sfnt_off0000aadf.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xAADF 4324 bytes