Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f743a7b87bb755a…

MALICIOUS

PDF

35.5 KB Created: 2020-08-16 15:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c2ca834fde8efd96edbcd7a0f0193b SHA-1: a90d78c79fa7b34d3be562773ebd8db811845c59 SHA-256: 1f743a7b87bb755a2024842e831f43714f6183a95cdee89b494b363ea77694a9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to potentially malicious redirectors or link farms. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains garbled text but also includes the URL https://ttraff.ru/pify?keyword=last+blade+2+apk+android, suggesting a lure or redirection attempt.

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=last+blade+2+apk+android
    • http://wexog.conjureknits.com/uploads/1/3/2/6/132681670/cc90ccb.pdf
    • http://lekuzabiz.craftofscientificwriting.com/uploads/1/3/1/3/131379808/c5e48fdd27a9.pdf
    • http://files.nekrubs.com/uploads/1/3/0/7/130739656/2536084.pdf
    • http://rarisex.roland-realty.com/uploads/1/3/1/6/131607163/9242480.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/80990347015.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/70820082393.pdf
    • https://cdn.shopify.com/s/files/1/0444/5837/7383/files/virtual_assistant_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/attributes_of_a_leader.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54729765263.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/41701353466.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/befol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6852/files/25311848071.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/red_black_tree_deletion_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/sun_tracker_pontoon_boat.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/used_car_bill_of_sale_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/54726358439.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/xikezuxamilugenureso.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_off00004d37.bin
2ecd529f2d2287b61ce7c936cf5ad5d9f0eaadb0a584d2f535fb003e9c9ff540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D37 5228 bytes
font_01_sfnt_off00005f0c.bin
2cf5276293f338886ca8fecb084d0232309531862808ef15c894e3fcdf799ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0C 10000 bytes

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