Malicious PDF — malware analysis report

Static analysis result for SHA-256 79664b0bc2d41c3d…

MALICIOUS

PDF

34.2 KB Created: 2020-08-31 07:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12384266e7b7a244c6d37cceb4fb8847 SHA-1: 53739b9d77c956b60aac6d4cec6f4aa1f92c9a62 SHA-256: 79664b0bc2d41c3d398487f608ee383f84083488d6c500200c5ef96f282d9e3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=write+parametric+equations+in+rectangular+form+calculator'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious sites. The presence of numerous Shopify-hosted PDF links further indicates a link farm or SEO poisoning tactic.

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=write+parametric+equations+in+rectangular+form+calculator
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6518/0321/files/543035971.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/perupituruvojatiwopitik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/boxedufezokobivoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/nijeweguwukelukuzefokob.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/saazish_1998_movie_song.pdf
    • https://static.usrfiles.com/ugd/1b8612_dc2784d8b04040289181eaacab78620c.pdf
    • https://static.usrfiles.com/ugd/39cb9d_4ba349b5130a414bba44593176cd46d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e81fd44c89242d781c1bddc7448a2a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e23a41186604fdda221f1467e8a191e.pdf
    • https://static.usrfiles.com/ugd/b7ed05_e2b0939ff4f3445f95b0f3625f158924.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76cb41a89294e1ebad1e8a4502a6ebb.pdf
    • https://static.usrfiles.com/ugd/e643da_5653f75de41443bf82e9ea258e5654ca.pdf
    • https://static.usrfiles.com/ugd/cf14a4_37a8ddd4a5d4439d928944229dcf42f3.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000478b.bin
e47d1dcc703cf29b7d088b1150951e5ea24f74ce0316a3d6e84a38dabd3f9a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x478B 5476 bytes
font_01_sfnt_off00005a21.bin
5868807ffc685352d6eee5ee933c0ba47c1ae274a728fe6de8e104c9b0b41ccd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 9768 bytes