Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb620d9ddd22cacc…

MALICIOUS

PDF

45.2 KB Created: 2020-07-30 15:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca349db727bac4ccdf663eef0613b8e6 SHA-1: 4e47513ea4e43f7d23221fec20ccdf604ba6b0c5 SHA-256: bb620d9ddd22caccb16d34dc6436c57d5ce98fbb2f1cc5e9432e59877dc1069f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, suggests a lure related to 'Jaquar bathroom fittings catalog pdf'. The presence of a link farm heuristic further indicates an attempt to distribute content or traffic through numerous links. The ML classifier 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=jaquar+bathroom+fittings+catalog+pdf
    • http://files.riverparishtheatre.org/uploads/1/3/0/8/130874382/5545001.pdf
    • http://files.rootedflowers.com/uploads/1/3/1/4/131406985/busotusu.pdf
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • https://cdn.shopify.com/s/files/1/0429/7913/1551/files/duvezizigadudelotidorubob.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/14719875073.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8309/files/meraforawofem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/74478647627.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/25037735282.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/buxesebapenesul.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/gimafubowup.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/33220331267.pdf
    • https://cdn.shopify.com/s/files/1/0428/2567/9015/files/90643315438.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/67934260962.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/mevojelopuzijubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/jizoses.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/
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/25037735282.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068da.bin
f8f46fec3fd333a8348157854a081defe0d67f96f0f22e8545f726b78b41fe2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DA 5588 bytes
font_01_sfnt_off00007b9d.bin
9e05a3dcb8c15900e558cf61023f14e0a11e043299e156519ad7bce0aae877f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9D 14220 bytes