Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d6ebe0a8f01897…

MALICIOUS

PDF

41.5 KB Created: 2020-08-14 01:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22101fbe0f986f08890199179d197437 SHA-1: 64d68e04e5873de0e0543cb300b861249989a710 SHA-256: 90d6ebe0a8f0189752889e8cb915ac6b67f6b83458f5d05aaf6e3325eefb0991
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.ru'. Another critical heuristic identifies a PDF link farm, suggesting SEO manipulation or a distribution mechanism. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the sheer volume of links and the identified redirector suggest a malicious intent to lure users to external, potentially harmful, content.

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=android+21+vs+goku+manga
    • http://files.valgbbo.com/uploads/1/3/0/8/130813094/2570967.pdf
    • http://bodamaje.chairsaustralia.net.au/uploads/1/3/0/7/130776167/1831649.pdf
    • http://files.hippo2020.com/uploads/1/3/0/9/130969085/vanepikapifuladurij.pdf
    • https://cdn.shopify.com/s/files/1/0431/7151/2480/files/56813179215.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/vurera.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/40352191117.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/apostila_c_caelum_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/junurililuwikolujola.pdf
    • https://cdn.shopify.com/s/files/1/0440/2148/1622/files/22122301577.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/revista_eudora_ciclo_6_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8775/7461/files/english_speaking_practice_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/liwidererekokuvarev.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/zeredodemogupu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6060/6616/files/48065671266.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/30383225526.pdf
    • https://cdn.shopify.com/s/files/1/0429/9096/0799/files/pewdiepie_seed_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.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_off000063f1.bin
d74e2e45e22fa940658b344a2e34ee169ebfa5a441ef5b6396795ef7a2c86d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F1 5412 bytes
font_01_sfnt_off0000764d.bin
86cc0eab77f54a6289768415f55be935807e0b21648d17aebbc74ae544235039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764D 10224 bytes

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