Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cbfcda78a9f1d2…

MALICIOUS

PDF

38.2 KB Created: 2020-08-02 22:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18f3e04a988e03e5c344d6368c550e28 SHA-1: f7b997d6d1ecf56593ae727a6693151500512e30 SHA-256: 79cbfcda78a9f1d20de0f746b362c0b1f86a366860ecc88cc0d0446395bb1eb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting an attempt to lure users to malicious sites.

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=game+bar+presence+writer
    • http://files.nikiclickit.com/uploads/1/3/1/3/131398573/5298224.pdf
    • http://files.aratiinternational.com/uploads/1/3/1/4/131453065/tuputisizux_nulixasaleb_zapudid_lowexumogufun.pdf
    • http://files.shannonecameron.com/uploads/1/3/2/6/132695430/953582.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/19501593836.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/44685496159.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/68630748950.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/najumopelikudebuguzekat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/rebivi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/bopujugiraw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3781/files/mufub.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3443/files/civil_air_patrol_drill_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0429/9695/7343/files/10722095290.pdf
    • https://cdn.shopify.com/s/files/1/0428/0975/3767/files/lorazogolale.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/vovazeditazirokesez.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_off00005831.bin
08902f7f9782b5e6f13386a317bac50e14b4256ec55ba6802e02aeacb7b93a58
pdf-font-stream PDF embedded font (sfnt) at offset 0x5831 5312 bytes
font_01_sfnt_off00006a34.bin
e4f6693582926b4481c4562455fe8f14baaea5e1bad3acaef7306685f4144c10
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A34 9868 bytes