Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91238ef672b41c0…

MALICIOUS

PDF

32.9 KB Created: 2020-08-16 19:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a57d9bb599a129b61e9c904be7cc6fd SHA-1: f60488962c53598d1c74bfa8dca0c3e00c24a6fa SHA-256: d91238ef672b41c096dcc94332aa4ac50f6a6e7d0d4e5ea3e4947bd6b9baa7bf
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain text related to 'Rcog guidelines vomiting in pregnancy' and also lists the malicious URL, suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to distribute malicious 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=rcog+guidelines+vomiting+in+pregnancy
    • http://files.flamencoinsideout.com/uploads/1/3/2/6/132682329/vilubunesakasiloda.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/gakamajobejikijodipa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1318/files/99408829485.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/bupetuwi.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/ringtones_from_youtube.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2974/files/saruwixote.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/english_in_biological_science_ian_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93336639176.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/porexitosorokok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.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_off000042ed.bin
b1f62128dc9621db26a1f2d44f8663286b95c8161d2d4e15210bc78ad7eaf8fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42ED 5560 bytes
font_01_sfnt_off000055c8.bin
450c0b872886d2aea6af3dc9cfdcc5bbae25833305b87aa6b46d117939750950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C8 9804 bytes

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