Malicious PDF — malware analysis report

Static analysis result for SHA-256 51787b070dcd45cc…

MALICIOUS

PDF

41.3 KB Created: 2020-08-04 08:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 259a3d95c94a61f42bee544e08d16855 SHA-1: c2572e3247707fd8adb7aa16922e6fb0c286f5c9 SHA-256: 51787b070dcd45ccd190ac8aa69aa4c9b3a3daed245f2dd11fdc6f0c156ea804
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=lord+you+are+always+here+with+me+chords+pdf'. Additionally, it exhibits a PDF link farm heuristic, embedding numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the same suspicious URL, reinforcing the lure.

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/pify?keyword=lord+you+are+always+here+with+me+chords+pdf
    • http://files.paradisevalleyequine.com/uploads/1/3/1/0/131069899/5cd997d69d5971.pdf
    • http://files.walnutgrovebaptistchurch.net/uploads/1/3/2/6/132695569/5ad17d7bca903d6.pdf
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/5570184452.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/rogawski_calculus_early_transcendentals_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/guvefugasonokoxalutek.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/kexelisigijaxanutoveponij.pdf
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/43776479406.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/86969912538.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/6378230272.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/duplicate_title_missouri.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/davukubipenafep.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/73406069127.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1185/files/supercapacitors_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/mazekibitolasesopaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8167/files/bonorin.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_off000062e2.bin
1fa192b259ba006c320703de69f4658658c6ff91f51afd89fa450684c116d6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 5532 bytes
font_01_sfnt_off000075a2.bin
d6f1ac71b71bb6eb2a00d8fe4faf2788e5086df628cb993e89a953bdadd6a4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A2 10088 bytes

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