Malicious PDF — malware analysis report

Static analysis result for SHA-256 995d5589395cc621…

MALICIOUS

PDF

53.7 KB Created: 2020-07-09 14:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e64d36d50407bff89e657f21027c4575 SHA-1: 878a341f4d3ccd9927e4302acd4cdacffaa82bc3 SHA-256: 995d5589395cc621e0f62416c9a8a7dce79bd8b4c90a7c0498b3f167de08577c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wb?keyword=iteration%20new%20gcse%20worksheet'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, with the first being 'http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the lure.

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.com/wb?keyword=iteration%20new%20gcse%20worksheet
    • http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdf
    • http://files.globalisationandcities.com/uploads/1/3/1/6/131607174/jilaxafufusekiw.pdf
    • http://files.essentialsspapasadena.com/uploads/1/3/2/6/132681625/2331784.pdf
    • http://files.lsestore.com/uploads/1/3/1/4/131437210/c1d05d94f.pdf
    • http://files.skylarnicestore.com/uploads/1/3/1/4/131437513/bogukim.pdf
    • http://files.empathies2017.com/uploads/1/3/1/3/131379680/raxude-vuvef-ruvule-sigadexipifesaw.pdf
    • http://files.yogainfo.ca/uploads/1/3/0/8/130873736/tipexerojijix.pdf
    • http://files.jessicaraeanderson.com/uploads/1/3/1/0/131070379/9611647.pdf
    • http://files.geraldinepilgrim.com/uploads/1/3/2/8/132815346/6780435.pdf
    • https://mujusituxuwe.files.wordpress.com/2020/07/14916879883.pdf
    • https://julames.files.wordpress.com/2020/07/lerire.pdf
    • https://famunuguraj492377956.files.wordpress.com/2020/06/muzebegafajasigurixego.pdf
    • https://negowonot.files.wordpress.com/2020/07/medaresadigizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevedizulav.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_off00008c28.bin
8236a964e78398b53d2111dab23d7d351c155354aeb831b48a05d27c9d875aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C28 4912 bytes
font_01_sfnt_off00009cdc.bin
99b433eacc249b0d8692265da9f384259f74fd6737ca7b8af4d18ebe667a81fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDC 14284 bytes

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