Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d20857b4c676d41…

MALICIOUS

PDF

44.7 KB Created: 2020-08-16 12:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57e7045672dd39349ca0cc5c9acd7622 SHA-1: d7a1384997d09b0097b43a813b95fda7f8930de4 SHA-256: 6d20857b4c676d41ee8fc1f550d4dbd6f4a0e0358ab45d6065030a2b1634127c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/wb?keyword=wedding%20song%20there%20is%20love%20pdf. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating the primary goal is to redirect the user to malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

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/wb?keyword=wedding%20song%20there%20is%20love%20pdf
    • http://files.onelightinstitute.org/uploads/1/3/0/7/130775363/90811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/sogevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/swift_download_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/piwawenaxidefadevufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ralaguguzovepusumizus.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/73271939987.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/analyzing_and_interpreting_scientific_data_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2523/files/berulizotujapir.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/colorfy_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4695/files/13673528692.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/89448785594.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/ruzajoxik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/54488376977.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/33299120191.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_off0000730a.bin
321a7a75125ae8b2e1ff10f0ab77397450b8dc312fff588f7f80e30d4e202a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x730A 5164 bytes
font_01_sfnt_off000084ae.bin
6f3fa6d53ee02a68572ddd987eb89656894d84cdbc629f42d867885d0365e494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 9808 bytes

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