Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4a5b443dfd4b8b…

MALICIOUS

PDF

43.5 KB Created: 2020-09-08 05:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c520843254f7b6f8988e53c07ef920c5 SHA-1: 571f9144a2d8e3d24622ce2db0e25a866d6b9a38 SHA-256: ff4a5b443dfd4b8b3d75db39fddbaa498fa4b94910918862377cda981fbbd3f0
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with a keyword related to 'Deadpool wallpaper'. This link, 'https://ttraff.me/pify?keyword=deadpool+wallpaper++for+mobile', is designed to lead users to potentially harmful content. The document also includes a large number of links to PDFs hosted on Shopify, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier 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.me/pify?keyword=deadpool+wallpaper++for+mobile
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/srimad_bhagavad_gita_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3526/2104/files/92658221772.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/raduvodonepogutalawesev.pdf
    • https://static.usrfiles.com/ugd/12f4eb_1336a510894b4218b8869793eb7020f4.pdf
    • https://static.usrfiles.com/ugd/921909_0749e73cab994e69b5aada9cb1af96bc.pdf
    • https://static.usrfiles.com/ugd/824332_48ff89d79ec044069903bd5d8f0de1e7.pdf
    • https://static.usrfiles.com/ugd/838e7e_0b39a7c4f7194a5aa6c93799e9e859db.pdf
    • https://static.usrfiles.com/ugd/610d21_33123e07e3b34ecc8b96fa441b62a8b5.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/47338461401.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/57072401507.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/bodas_de_sangre_simbolos.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/53006231254.pdf
    • https://cdn.shopify.com/s/files/1/0439/4650/8456/files/bhagavad_gita_as_it_is_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/zekizubowepusiwurivej.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_off00006b7e.bin
0a3b4931a984afb71abbabc25d62cce1b6cd0396e06f32958138319b47e17298
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7E 5240 bytes
font_01_sfnt_off00007d50.bin
d35fc1adcfdf342c277fb0b2495aa9a5cdc7adc8b44b204e10e53cadecb8208a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D50 10480 bytes