Malicious PDF — malware analysis report

Static analysis result for SHA-256 7620a6d8fc4bf26f…

MALICIOUS

PDF

50.7 KB Created: 2020-07-31 15:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ebc8677d78d5e836aa4d2b05ca71e2 SHA-1: b212f79bea2b53a1a4314902cf85ffb22ce5f498 SHA-256: 7620a6d8fc4bf26f6feebf8e719abf5dee56da36c1d80ae8789b29da2ecd1c20
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with the promise of 'ninjutsu techniques'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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/pify?keyword=ninjutsu+techniques+pdf
    • http://files.karmicguidance.com/uploads/1/3/2/3/132303310/serusaj.pdf
    • http://files.stockbrosresearch.com/uploads/1/3/1/6/131636689/rilusolonitizo_raxojut_jolodidesi.pdf
    • http://files.usecuniversity.com/uploads/1/3/1/3/131380440/93845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/kajologijutekiwumojosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/pujagivopozotabusilunowag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/sedilenasunikemafojegek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54101174921.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/tazixakasones.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/18987983914.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/jidopurux.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/suxabunosafudovoxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/wezebif.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/neruz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d24.bin
b607fcc66868aa1145cda3d9542993fee11714ec088bcb09f2d797772aa532e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D24 3920 bytes
font_01_sfnt_off00008b09.bin
57a86cdd7b61c5afa1d20894efa6235651330e0cd9026c8c99cf685fc98080c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B09 4848 bytes
font_02_sfnt_off00009b86.bin
363881da42ce604c0c15a2db129d08715f1de9455665fbe868fb836e8260c13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B86 10096 bytes

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