Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4acd425f2fc372f…

MALICIOUS

PDF

44.2 KB Created: 2020-08-06 10:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e546d6855423494ee893309ee806d54 SHA-1: ecf99befdfc8382bf7f6a367cf62221092261115 SHA-256: f4acd425f2fc372feeec6efaba04110054361c398e8936cd3e9a5393cd05b9d4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=cell+phone+addiction+test+pdf'. This URL is designed to lure users with a seemingly innocuous document title and then redirect them to malicious infrastructure. The document also contains a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=cell+phone+addiction+test+pdf
    • http://files.solutionstailored.com/uploads/1/3/1/4/131453712/2607489.pdf
    • http://files.lisetteblanco-cerda.org/uploads/1/3/0/7/130776823/sobonefukobaxejowapo.pdf
    • http://files.crypto-story.com/uploads/1/3/1/3/131379732/nuzenenilove.pdf
    • http://files.grimoirequest.com/uploads/1/3/0/7/130776592/sigupozikutovuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/nitosiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/1793/5770/files/15043911384.pdf
    • https://cdn.shopify.com/s/files/1/0429/9728/5027/files/ap_budget_2020_20_highlights.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/rhizobium_culture.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/annemarie_schimmel.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/nalimenekigulufonane.pdf
    • https://cdn.shopify.com/s/files/1/0438/3863/6192/files/27_bus_schedule_septa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8940/3810/files/66412785708.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/kividoziduto.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9421/files/25477125651.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/red_like_roses_part_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/sobutoviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wunize.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_off00007066.bin
7070729961206427e6a907fdfddfb88a7eb9481c8858a393423b065f4398c588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7066 5052 bytes
font_01_sfnt_off00008193.bin
32e79daf6feac85bd2a791c9d01c401ad7a05bd533072f6c77bdd3838987b5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8193 10060 bytes

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