Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfaa5cae0d88c56…

MALICIOUS

PDF

144.1 KB Created: 2020-08-12 09:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f1b3eb8bb8b37711a053c902d0720b SHA-1: a8ee4bf5fab666225dda07677c780750a61d09ea SHA-256: 4dfaa5cae0d88c5636fce67255477311da483a3beabf9c8deeb1a1521566d1e2
152 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=the+early+abbasid+caliphate+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=the+early+abbasid+caliphate+pdf
    • http://files.feedthepassport.com/uploads/1/3/0/9/130969041/juwatazofined.pdf
    • http://files.luxesneakerboutique.com/uploads/1/3/0/7/130775853/gizuluveroji-rofinowaxuk-jejis-mokuzigavabi.pdf
    • http://xajuba.corydixon.com/uploads/1/3/2/6/132681352/328d11.pdf
    • https://cdn.shopify.com/s/files/1/0437/1775/5034/files/34962629333.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0103/files/zaxipipafafegidiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0528/files/54377238871.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/loop_antenna_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0437/6143/4773/files/vopevegagowipowuxarerop.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/dafuziwezogowa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8079/2729/files/sixozaroxolugisi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/53856884441.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/vogupiwozuwubovibemipovog.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/kexuwuzunuminekosevafoguz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00020a91.bin
669398617e566fba37930844c0422a5a85d12e90b4fd4d3427e4378df977e92a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20A91 22904 bytes
font_00_sfnt_off0001b74e.bin
9545ded7142d024fc2e54baa43844414e15a05b942b1c79a577c84f1de7c4f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B74E 3684 bytes
font_01_sfnt_off0001c465.bin
35bbadd88423f7a65f806f6adccb5d31b19e04a39641b1afe4aefb18f14426cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C465 5432 bytes
font_02_sfnt_off0001d6da.bin
5cc11e22fa897f0dfbb08a21fff4aff32027d2f11cdfd552f2334168322fd46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6DA 17172 bytes

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