Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08d48cae574d867…

MALICIOUS

PDF

63.9 KB Created: 2020-07-23 00:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8cdfe3e30f0d89db7cbbd3623beac90 SHA-1: c946ddd2c53082c6be1e5ded35f3fa5d0cb01770 SHA-256: f08d48cae574d867ab65444e4ea6f7a9f8d571dde504c45ac5a26067b66200f9
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, suggests a lure related to a 'Bt home hub 5 user manual'. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=bt+home+hub+5+user+manual+pdf
    • http://files.billbartels.com/uploads/1/3/0/7/130739856/pipulivefurolo_lelisoxiti_fugogununuvoze.pdf
    • http://files.peterandannemariehelms.com/uploads/1/3/1/3/131383607/dorexodafo_paxofugipo_sikejorukolu.pdf
    • http://files.spcwaterdistrict.com/uploads/1/3/0/8/130814594/kovanajad.pdf
    • http://files.gymfreaks.net/uploads/1/3/2/6/132695339/be1fff13c82.pdf
    • https://cdn.shopify.com/s/files/1/0436/1915/6130/files/10860507039.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/25003182798.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/pedowazodapatekedupiva.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/vozoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://gefadosujugi.files.wordpress.com/2020/07/wezadufedewir.pdf
    • https://sifizuxu.files.wordpress.com/2020/07/50954002195.pdf
    • https://momilipifix.files.wordpress.com/2020/06/62561804849.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1059/files/bijamobubejurodiligadu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/61173213621.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/darasimexererodiwafaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/zapefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/jalenisifadunedudawiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/67104619915.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/xezekuwilojolamaxapedarol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/95234903130.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_off0000b0d6.bin
7300700e98fbd74c94ab1080aa0e62d37c7b54a1d34e929eabb989539f3dddbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D6 5428 bytes
font_01_sfnt_off0000c31a.bin
8f2af7471adcbd8789c7f64b4680e3d5da89025aa02ce173f799d4a0de5ac133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 14944 bytes

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