Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9049a9b8be238c…

MALICIOUS

PDF

45.9 KB Created: 2020-08-03 08:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe814ffd70368e52bd5ab7a7935ce5f SHA-1: 502c85734a56ee4793669faa52f8e0ef04bee390 SHA-256: 5d9049a9b8be238cb7b9adcc52d56e75f81e8a3a81f50deb0ea8827f59161aeb
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files, many of which are hosted on Shopify. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages.

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=avl+tree+java
    • http://files.jazikatxox.com/uploads/1/3/1/3/131379740/sebixejajawaropan.pdf
    • http://files.peppertreegoldendoodles.com/uploads/1/3/1/3/131378942/kalarivo.pdf
    • http://files.chefzanderault.com/uploads/1/3/1/4/131437677/639afbe.pdf
    • http://files.schilbersjewelrycastle.com/uploads/1/3/0/7/130776088/4bff4411f41b8e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/dino_gate_ark.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/bissell_spotbot_33n8.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/81441772094.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/nelagarewejisedefemudoru.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/52340598466.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/xomopufolitat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/jemupexibasigoduku.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/ropejozotaxavabizimu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1325/7885/files/fopizox.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/tobapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/94685179241.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1167/files/42014567190.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/74654318431.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://algs4.cs.princeton.edu/33balanced/tinyST.txt
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f4d.bin
33e8cb7eb9c724ebc603c9c257fb5041595d2256bfcce2d4f5dc115fed0e3a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 4152 bytes
font_01_sfnt_off00006d6d.bin
91be97c287ce9bb1b9d9585844d96c945a732991ad43bbe7add43af957b839a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 14528 bytes
font_02_sfnt_off00009b4c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4C 4324 bytes

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