Malicious PDF — malware analysis report

Static analysis result for SHA-256 5233c57615dc5fbe…

MALICIOUS

PDF

46.4 KB Created: 2020-09-01 01:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 362d6f04629fdac873614696df0b1ec8 SHA-1: 2a39b14fdc6d7ac698636f35683e6e54e03d0f2e SHA-256: 5233c57615dc5fbeb39756fdad301d038a07e214a1b865a72081b6dcab17405c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=bruder+mask+eyelid+sheets', is identified as a malicious redirector. The document also features a link farm hosted on Shopify, likely to obscure the malicious intent and appear more legitimate. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.cc/wix?keyword=bruder+mask+eyelid+sheets
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0435/2586/5636/files/zotafaxuvir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bizem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/gorer.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/nofurekevikiruduliledejum.pdf
    • https://cdn.shopify.com/s/files/1/0461/9406/5557/files/ann_arbor_police_incident_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/546469477.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/bawewatoluxetokavexogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/xinapagojofugugajonevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/wekojekep.pdf
    • https://cdn.shopify.com/s/files/1/0440/9032/7205/files/aprendiz_de_brujo_libro_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.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_off000061fa.bin
7350bb1fbef3166e15dae52f65366a1f575caadbb6658e5e484f5427402f2dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 5280 bytes
font_01_sfnt_off000073c5.bin
488d44bce8246fe0cfbb32f414920d3582a226475cab9cab73470bea8974df33
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 10584 bytes
font_02_sfnt_off00009834.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9834 16092 bytes