Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d4f0938236aa5…

MALICIOUS

PDF

47.6 KB Created: 2020-07-21 15:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c1615cc170aec3e26e0428708e67d5b SHA-1: 869a575a3b8314d7429ab6cb8b898b8dc5fd58df SHA-256: 1a5d4f0938236aa55411c892bec9dd23ca3a1c8f7b55e3badedc023a7dfb6346
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector (ttraff.cc). The ML classifier strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of numerous external links, including those hosted on Shopify and other domains, suggests a link farm or redirection scheme designed to lead users to malicious content. The primary attack pattern involves luring users to click on these links.

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.cc/pify?keyword=cantate+domino+vytautas+miskinis+pdf
    • http://files.nydp.ca/uploads/1/3/1/8/131856176/081e07abc3315d.pdf
    • http://files.animasriverdays.com/uploads/1/3/1/4/131453718/6063301.pdf
    • http://files.mrfleischer.com/uploads/1/3/0/7/130776599/xokopuvet.pdf
    • http://files.moneyandlilia.com/uploads/1/3/0/7/130739039/vuzejusamekivuvez.pdf
    • http://files.euroconferences.org/uploads/1/3/0/7/130775249/xoramisiged.pdf
    • http://files.mrfleischer.com/uploads/1/3
    • https://cdn.shopify.com/s/files/1/0432/7584/5792/files/40043349665.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0429/4357/8278/files/duluvavapodojawufasepux.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/kebotafedidelupena.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/66250741179.pdf
    • https://jodupirif535214197.files.wordpress.com/2020/07/popifewevavugivakeberoj.pdf
    • https://rudukaleditu308957543.files.wordpress.com/2020/07/punonokomubawani.pdf
    • https://nurapanaki.files.wordpress.com/2020/07/8097881370.pdf
    • https://ramebojuje.files.wordpress.com/2020/07/2931197712.pdf
    • https://wemolugiwade.files.wordpress.com/2020/06/paparivamixiladetanup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wogol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/60247876589.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/37392315460.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/71277503753.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/2406718123.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/sotirubidefurolatepuraja.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/zopuzeboveli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88065476392.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_off0000779c.bin
e04dc6859605347aecc3de54f4782441dc7f0b67752b00001e244e686906db7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 5192 bytes
font_01_sfnt_off0000894b.bin
16ac041d7b068666aea60328d09ed53b7428cabe2485f0e5f5bc229925eab7da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894B 12660 bytes

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