Malicious PDF — malware analysis report

Static analysis result for SHA-256 a932fcfdacb872d3…

MALICIOUS

PDF

57.2 KB Created: 2020-08-14 03:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca53c6a501eb6cc669e816e77045ae73 SHA-1: c8f817dd821107827ebae06d23e7103606355e82 SHA-256: a932fcfdacb872d3fbd04bf8313654e4767c40dd23e3df94e579a3de71850fdb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=sati+ansuya+ke+bhajan' which is likely used to direct the user to a malicious site. The presence of numerous links, including to Shopify domains, suggests a link farm or a method to obscure the final malicious destination.

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=sati+ansuya+ke+bhajan
    • http://jojuxutab.comedianambrosejones.com/uploads/1/3/0/8/130814088/vagibariwebuz_rogupuxodokave_lesalaluxox_turalutagavo.pdf
    • http://supoxoxe.halobonline.com/uploads/1/3/1/4/131452821/6422899.pdf
    • http://wowadu.periscopedigital.com.au/uploads/1/3/2/7/132710712/virawajenesile-zoponuvipuzarev-figumulure-kakijejodovem.pdf
    • http://mepul.bereregischapel.org/uploads/1/3/0/8/130814328/8244957.pdf
    • http://files.pacificrimmfg.com/uploads/1/3/0/7/130776674/sifexutivito.pdf
    • https://cdn.shopify.com/s/files/1/0439/9159/7214/files/xujufosozexotijunerorurom.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/39856706726.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/zodej.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/77223115730.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/73910249420.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/wcf_vs_web_api.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/73405546513.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/83538061572.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/bavasovafupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/20749540381.pdf
    • https://cdn.shopify.com/s/files/1/0435/0266/5892/files/mubamapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/danapitibojozonirinukeva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b99.bin
91705bd7f8db16922760ffcd6ba69971f856db3e86b7e6cc5d0a60cb3318b0bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B99 23048 bytes
font_01_sfnt_off0000a443.bin
58dc86b8aa1ba8f3c9e30d26d4dbc112499699c8c81da4ce77b794b5ed0e9af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA443 5128 bytes
font_02_sfnt_off0000b5b8.bin
abd87f9bc1697b33bedfe584ade5399edc0134a170a3f0cab5adb6e2670caa92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B8 10004 bytes

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