Malicious PDF — malware analysis report

Static analysis result for SHA-256 435a559d88ffed42…

MALICIOUS

PDF

38.9 KB Created: 2020-08-23 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1773a6fb43538c8687862f1e2e6782ba SHA-1: 83f265e797426632a407e2fe2eeaa14f31d71c52 SHA-256: 435a559d88ffed422319975a6a1d9a187267465052ceed1bc4f7f9f8f5c54c34
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=innocence+ffxiv+guide', is identified as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites through a deceptive pretext, likely for further exploitation or credential harvesting.

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=innocence+ffxiv+guide
    • http://files.dsmtoolworks.com/uploads/1/3/1/8/131872070/ac808a33c2f.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/vomirijakufigos.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/daikin_air_cooled_chiller_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/66464075882.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/30355816770.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/95177434325.pdf
    • https://cdn.shopify.com/s/files/1/0435/7269/1099/files/moviwujojejawi.pdf
    • https://cdn.shopify.com/s/files/1/0464/8658/5512/files/free_piano_sheet_music_happy_birthday.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7026/files/free_adobe_illustrator_infographic_templates.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4583/files/65661351171.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/zipibagipebopawujuxixeje.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_off00005d4b.bin
0dc2d3a60f108ce40c92550760111ee6ea3e9b1a78217ef7276abe4e0e64d078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4B 4740 bytes
font_01_sfnt_off00006d88.bin
0498e84bba7d0b39a2c6f41ae6bb203d53aa4da9234cfeeb9d623db6e1ddc125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D88 9872 bytes

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