Malicious PDF — malware analysis report

Static analysis result for SHA-256 341ebd6291fd0ab3…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 02:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9a07ee49c243d0cdac3ffa92948c31a SHA-1: 33306a579a238d89552435484f0c78ac5d2e1eb2 SHA-256: 341ebd6291fd0ab3e745878d96f7ed0940d5eb5e5c8e0ba150f9095012e6aeed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=grande+encyclop%25C3%25A9die+larousse+pdf. Additionally, the PDF is flagged as a link farm, suggesting it's designed to distribute traffic to numerous other PDFs, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

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/pify?keyword=grande+encyclop%25C3%25A9die+larousse+pdf
    • http://files.aletalederwasch.com.au/uploads/1/3/1/4/131408546/5638055.pdf
    • http://files.queenslandcallers.com/uploads/1/3/1/4/131407980/xaperusef.pdf
    • http://files.braverthanthewaves.com/uploads/1/3/1/4/131453807/5359755.pdf
    • http://files.aitnde.com/uploads/1/3/2/6/132695662/6631430.pdf
    • http://files.libertineblends.co.nz/uploads/1/3/1/3/131398094/megewowar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/legawopadopexemonefoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/tolevevilejogewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/44118272899.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/9864597954.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/google_dorking_commands_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/tube_digestif_du_lapin.pdf
    • https://cdn.shopify.com/s/files/1/0436/6571/9449/files/rafiratemol.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/tabevipa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/mifemukosenavokavi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/20838795234.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/13426935190.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/71167536498.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fcf.bin
9f8465b3eac59931d95056f7f5e162a09e6d7300b7c5f9ecf39e81d1c5afea57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCF 5424 bytes
font_01_sfnt_off00007218.bin
752bd545f8d569c85b5148a18b1202de4f4982cd670e7c1fb05065958df574e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7218 15328 bytes

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