Malicious PDF — malware analysis report

Static analysis result for SHA-256 defbe28387c6160b…

MALICIOUS

PDF

37.2 KB Created: 2020-08-30 21:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49e41c8949f967bd7478534b2e4143a SHA-1: 5103f4d9329368cc361e3a5130e63bc694695182 SHA-256: defbe28387c6160b2849484e33a2692a7d03c715bffac7b585be10f5892e13f9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link redirects to `https://ttraff.cc/wix?keyword=laminas+anatomia+humana+gratis+pdf`. This redirector URL, combined with the ML classifier's high confidence score, indicates a malicious intent to lure users to potentially harmful content. The document body itself appears to be malformed or heavily obfuscated, but the presence of the redirector URL is the primary indicator of malicious activity.

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/wix?keyword=laminas+anatomia+humana+gratis+pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/rowudojemarepidelibete.pdf
    • https://cdn.shopify.com/s/files/1/0441/3590/7480/files/63176703672.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/73240650102.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/84461241233.pdf
    • https://static.usrfiles.com/ugd/b8c837_74942d65a4a642b8b780e8b884f61fd6.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_864f25d4c14a4fe0ac868df531e7a4bc.pdf
    • https://static.usrfiles.com/ugd/afe78f_4517ef9a040242afa0522d94484c4ce8.pdf
    • https://static.usrfiles.com/ugd/90c678_8bec588da69144e6bfd6f9fe9df4e72a.pdf
    • https://static.usrfiles.com/ugd/9757e7_1aa75a27144a48a8814fedcde9abb6aa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/katopafuwamenurelapigi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/zexuravumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82973104521.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/2302271785.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_off000047f4.bin
343d2d825f5dfe59c48e71d99eb625fd2f0c2a0d79e9bab1a900121588608cde
pdf-font-stream PDF embedded font (sfnt) at offset 0x47F4 5128 bytes
font_01_sfnt_off0000592c.bin
8ba2d2d2a27b65a1ff2e78c99d976231b3b077bac45e59b5fa42435fc5aa5bdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x592C 10076 bytes
font_02_sfnt_off000079f3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F3 4324 bytes