Malicious PDF — malware analysis report

Static analysis result for SHA-256 6389c199a11ca9ab…

MALICIOUS

PDF

34.5 KB Created: 2020-08-20 13:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cac9978e436d2d87d0ff9ccc8f70812f SHA-1: 181d7cd402a76502b2410b9ba6590bcf92951cbe SHA-256: 6389c199a11ca9ab139a1142a14f10fe710c8e93b5a68a6afa33be3e79d9a1ef
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent of leading users to potentially harmful content.

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=chsp+respite+guidelines
    • http://files.morningsideunitedchurch.org/uploads/1/3/1/4/131406288/b6c549d76b9dd7f.pdf
    • http://loleredu.coldcurve.net/uploads/1/3/2/3/132303134/dizaperu-wodixilijusebob.pdf
    • http://files.wisefirstgrade.com/uploads/1/3/0/8/130813988/bewevofak.pdf
    • http://files.rooznote.com/uploads/1/3/2/6/132682790/xumikuxexeki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8097/2456/files/airmon_ng_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/understanding_learning_disabilities.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/short_biography_of_william_shakespeare.pdf
    • https://cdn.shopify.com/s/files/1/0455/5482/7429/files/most_common_english_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/zegofexuredudim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/76091444569.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/xewojoribu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7192/9496/files/9742439840.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/55794186724.pdf
    • https://cdn.shopify.com/s/files/1/0432/4448/6811/files/effects_of_tardiness_in_academic_performance_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/camping_checklist_australia.pdf
    • https://cdn.shopify.com/s/files/1/0436/4677/9552/files/86864673834.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_off00004d7a.bin
6dad5af31b84b8edd9d7774e0adcd28432acc41b202ef114470a6da8a25d9f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D7A 4916 bytes
font_01_sfnt_off00005e2d.bin
5827268b7631fcc71add40bc7582953d5394ae60450ba88193a7c77551dbbdd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2D 9128 bytes

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