Malicious PDF — malware analysis report

Static analysis result for SHA-256 39876339c03ff292…

MALICIOUS

PDF

37.3 KB Created: 2020-08-29 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19fb77421ab594534fa8b518ba7edead SHA-1: f796b07227d0ef5f3a536eabaeded81f0cdc3184 SHA-256: 39876339c03ff2921884618944fd438678117543ee9724ef663a32ccfd9834b5
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, forming a link farm. One of these links, 'https://ttraff.com/wix?keyword=matematik+olimpiyatlar%25C4%25B1+soru+ve+%25C3%25A7%25C3%25B6z%25C3%25BCmleri', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled, but the presence of the malicious URL is the primary indicator of compromise.

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.com/wix?keyword=matematik+olimpiyatlar%25C4%25B1+soru+ve+%25C3%25A7%25C3%25B6z%25C3%25BCmleri
    • https://static.usrfiles.com/ugd/b8c837_5f5df364077b4c2c9bb7c1e71aeafdba.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e202a750dc94e2f835ba47a38de55a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a2a6f31a632415b9c76541145582218.pdf
    • https://static.usrfiles.com/ugd/b8c837_65061ddcc2a14518bc7b47bbc370ada7.pdf
    • https://static.usrfiles.com/ugd/b8c837_34625a01ff0745c592c48a8b2f747055.pdf
    • https://static.usrfiles.com/ugd/77d535_f09f6b3c75aa435380c7454e010b5ef8.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd43c14f88954335ae0f6564ca109218.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab4fb75bd07401dbd7e7bf39f9660f0.pdf
    • https://static.usrfiles.com/ugd/97634b_2d6b5013fa354cfa9577e94688f33c2d.pdf
    • https://static.usrfiles.com/ugd/de3d83_f0fb2077bf6141d8974fc6255f32fc17.pdf
    • https://static.usrfiles.com/ugd/b8c837_32bc560b756d44e78d1964fecf29cc72.pdf
    • https://static.usrfiles.com/ugd/b8c837_09afb7bc9c834125bc5547bdd4df0aea.pdf
    • https://static.usrfiles.com/ugd/b8c837_14efcd46fbc64a84a07e708303c63fc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e274c87c17b4c05b8a8f33dbef06cbe.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_off00005014.bin
ebd9355c8f649718b240608ac80fd8accf2d9482923ec9121a2fffa0993a4c1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5014 5720 bytes
font_01_sfnt_off00006312.bin
7b92da989b1de556a02f9d5e25300c7a0d9e2a016b2890c3146018b95b48d6e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6312 10956 bytes