Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5519dec67a94a7…

MALICIOUS

PDF

49.6 KB Created: 2020-08-10 20:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0b537c9a85aa0780b7bfd8e6438cea SHA-1: 50be9548b0ae7c13895d47af8ec4e6f4cca37707 SHA-256: 4e5519dec67a94a720c27d5f60eda68ea16db5fe624995e083f162f307b2b2e8
154 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 pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users through these links, likely to a phishing site or malware download.

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=azatioprina+efectos+secundarios+pdf
    • http://fularufe.ellabonitastores.com/uploads/1/3/1/6/131637881/c0143d97.pdf
    • http://files.adamknapper.com/uploads/1/3/0/9/130969358/tosomu_womobolix.pdf
    • http://files.ninareistad.com/uploads/1/3/1/8/131856005/xukavuzujanuto.pdf
    • http://files.diamonddashmealprep.com/uploads/1/3/0/9/130969334/854422.pdf
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/ginuze.pdf
    • https://cdn.shopify.com/s/files/1/0439/9664/3486/files/tojodejuzanojigifak.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/kavifexezedavik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1984/files/tatiratefuje.pdf
    • https://cdn.shopify.com/s/files/1/0437/5399/6442/files/how_fast_is_druid_travel_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/43375705251.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/senimukeviraputatup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/92646800811.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/4221439090.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/deutsch_aufgaben_1._klasse.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/71640224830.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.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_off000081dc.bin
e2f1e75fb2b9cabb23b2de251379976e8d494bc9f1b966c883e625cce66a1415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DC 5156 bytes
font_01_sfnt_off00009378.bin
3eb1ddfbb63b494b92797ccf7668a59e582ab99ce2d3b3f1d691c09f964e023d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9378 11204 bytes

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