Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb469fa94e97cf18…

MALICIOUS

PDF

39.3 KB Created: 2020-08-20 19:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2d22bcc1876577c5eac1bac12d5a8e9 SHA-1: b3141e59fa8609e4b4e4c30a8a3b0e44a3e487e5 SHA-256: fb469fa94e97cf18ccd9155589c508a1a8efd33701e9406a0d8c8f937f89931f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free download for a mobile application. The ML classifier strongly indicates maliciousness. The document body and embedded URLs point to a lure for users to click through to potentially malicious content. The presence of multiple Shopify URLs suggests a link farm used to distribute the malicious payload.

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.com/pify?keyword=viber+app+free++for+android+mobile
    • http://nubukuwum.artfulflowe.com/uploads/1/3/0/9/130969341/3994177.pdf
    • http://files.ringatedesigns.com/uploads/1/3/1/8/131871721/d9f1173e2dce4c.pdf
    • http://tevil.thoughtandprogress.com/uploads/1/3/2/6/132681947/rikekuw-muxiwew-kilufusufukikug.pdf
    • https://cdn.shopify.com/s/files/1/0434/2389/1618/files/wapur.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/xopipitofepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/avesta_zoroaster.pdf
    • https://cdn.shopify.com/s/files/1/0433/5874/8837/files/xidorafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/nigigizazipabixuref.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/fiwugakopawevujowexo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4497/7305/files/the_coming_revolution_capitalism_in_the_21st_century.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_off00005f1c.bin
7ef6da67835de970b15dcfa73f5253b5bf05d8c7f31043b122565019112d5ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 5116 bytes
font_01_sfnt_off00007069.bin
a81d7410cfee5dc8d41e4c61610b9eaf9d3e3eca819eb6882844f72f965cac78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7069 9456 bytes

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