Malicious PDF — malware analysis report

Static analysis result for SHA-256 985d108561f9009a…

MALICIOUS

PDF

38.8 KB Created: 2020-08-10 02:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22d4704991d8a6d122794cf7a1873482 SHA-1: 7510ea04ed67467c8861136286d7e05a5513e155 SHA-256: 985d108561f9009ab6e35591b401b1f7bf0af33dc467c14b15b4f49a5c47d471
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=second+conditional+reading+comprehension+pdf'. The document body, though partially obfuscated, contains this same URL, suggesting it is the primary lure. The presence of many other links, predominantly hosted on cdn.shopify.com, indicates an attempt to create a broad network of redirectors or to obscure the true malicious destination through a large number of seemingly benign links.

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=second+conditional+reading+comprehension+pdf
    • http://files.stonycreekenglishshepherds.net/uploads/1/3/1/4/131409761/2990640.pdf
    • http://files.ipmed.org/uploads/1/3/1/6/131637257/mabir-xudemiwamezu-xitalikonixekad.pdf
    • http://files.chryssyandheather.com/uploads/1/3/1/4/131452846/sonuruxa.pdf
    • http://serodek.thenorthwestblogger.co.uk/uploads/1/3/2/6/132681513/vobaberodifufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/dark_angle_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/21260486601.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/cassation_decision_volume_5.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/4797441960.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/8848850899.pdf
    • https://cdn.shopify.com/s/files/1/0439/7616/3486/files/fixegitexesotufanap.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/mazinerokiwetajimifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5702/0056/files/unity_stencil_buffer.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/mental_health_problem.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/70605274386.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_off00005a9e.bin
927f34932194b111d3b9ebea6534249f9d08875e7bef8892c16264da444bec79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9E 5672 bytes
font_01_sfnt_off00006dba.bin
d60526511279b93b21acb62a415c0571d9ff75159cfe59d0e7c5267a711b5df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBA 9596 bytes

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