Malicious PDF — malware analysis report

Static analysis result for SHA-256 49efb2020a9d8f46…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 17:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f0cf314b29fbcc41288805274eb6c3 SHA-1: c7439d7358b3b5e62363db2a99ef5c3f5fbd2712 SHA-256: 49efb2020a9d8f4630ed14d25f45b8baeab16d38e3c581b7583fd2a3b469b2b0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL (ttraff.ru). This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. The document body itself contains the malicious URL and references to other PDF files, reinforcing the redirection 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/wix?keyword=assembler+plusieurs+pdf+avec+foxit
    • https://static.usrfiles.com/ugd/64d889_6da7ab26c02a4b3da48dd3ba97964fe2.pdf
    • https://static.usrfiles.com/ugd/4725f1_e1b23b79efbf4c338eabec11e424a3a7.pdf
    • https://static.usrfiles.com/ugd/6da380_6be4c65d4ea14138a49e8dd77b1472e8.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_471ffde1ab514d3ca1bbe7918172401b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7f35975917b49da92654a75801ee9de.pdf
    • https://static.usrfiles.com/ugd/82e28d_4052cc70e6c847b385e037dfabd8ae74.pdf
    • https://cdn.shopify.com/s/files/1/0434/9408/0677/files/wirupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8437/3406/files/warhammer_age_of_sigmar_generals_handbook_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/zipuluxur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/poledofewikatikad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/convert_to_rtf_online.pdf
    • https://static.usrfiles.com/ugd/7d21c0_d394139494c044ec96956b82ac1cdedb.pdf
    • https://static.usrfiles.com/ugd/bf650e_a23cfd0858f449d7be2954ad0fd645a7.pdf
    • https://static.usrfiles.com/ugd/a467d2_75ef9629875e4297b840ce5c62ab6d89.pdf
    • https://static.usrfiles.com/ugd/45e30f_367bdae294964a86ab3583322dbe28ff.pdf
    • https://static.usrfiles.com/ugd/9e41f0_4d34cdccab0342198cc864b5c46196cb.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_off00006088.bin
fb927a185432229fa3034848c4b73a2eebcd620a6aacd3fd2e24158f75127bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6088 5560 bytes
font_01_sfnt_off00007359.bin
998c1a3d82a1f3563d8d3736d63c65bb81d72bb5732bcba2fe32e5b194200916
pdf-font-stream PDF embedded font (sfnt) at offset 0x7359 11508 bytes