Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5b725ff5f34dd7…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 04:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df9d7340d15b2b84441a636636528ff SHA-1: ac4e58d2933210c81eb91920ef7a61badf021477 SHA-256: 0d5b725ff5f34dd701cf36ce7e750fd125ca8de6d327c59423e770c15155c63d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. It also features a large number of embedded links to other PDFs, likely part of a link farm or SEO manipulation tactic to attract users searching for cracked software. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=euro+truck+simulator+crack
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5849e1fc3eb24e5c8dc7a639d01e8667.pdf
    • https://static.usrfiles.com/ugd/b8c837_f71b9dade96d4f598317a87de5718914.pdf
    • https://static.usrfiles.com/ugd/b8c837_feffc8b05cac426e9b17523a50164663.pdf
    • https://static.usrfiles.com/ugd/b8c837_83e4c4ebe5e248818274c52a61ffd01a.pdf
    • https://static.usrfiles.com/ugd/b8c837_35eddabeec164694aa16ed90af27fc0c.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/jixom.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/vigikewebusubisokak.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/9905983675.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/latorukutobonezovunogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/soxik.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/nuzixupozasifulowixalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2460/5599/files/manualidades_botellas_decoradas_con_servilletas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/62626222390.pdf
    • https://cdn.shopify.com/s/files/1/0437/3472/8853/files/texas_criminal_and_traffic_law_manual.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_off00006bfa.bin
da7def50b1c09080e79cee1c2317f0b826920ae2414241714da6fa79f722b962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 4964 bytes
font_01_sfnt_off00007ccf.bin
391bbb8cd6cd27a09b8c83ec17218a61aab0441e6d7dbf9177c7e05190e7adbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCF 10904 bytes

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