Malicious PDF — malware analysis report

Static analysis result for SHA-256 0251feec6c6baf78…

MALICIOUS

PDF

47.5 KB Created: 2020-07-30 05:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e856e0f7cfefcc2641a675f1038ddaf SHA-1: 6ddc35aca63ab0c9fdca88b38f973da715ab2823 SHA-256: 0251feec6c6baf78df0772515acbf7b49e719439d5d1d7009bd01e39deb5a0d0
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 identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm or SEO abuse tactic.

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=spanish+alphabet+worksheets+pdf
    • http://files.viktoriasanto.com/uploads/1/3/1/1/131164129/5300626.pdf
    • http://files.presscoffee2go.com/uploads/1/3/1/4/131408970/1917072.pdf
    • http://files.joemckinneymurals.com/uploads/1/3/0/7/130775228/519b6729d48.pdf
    • http://files.defineyourbliss.com/uploads/1/3/1/8/131871658/9fc93758eff.pdf
    • http://files.jasonmokhtarian.com/uploads/1/3/0/7/130739269/f938b0d7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/3042221613.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/fowirokem.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/zugijumobomejupunefuxit.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3363/files/71884090375.pdf
    • https://cdn.shopify.com/s/files/1/0431/4605/1744/files/zadupodomof.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/jinarib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/30375268875.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/sinowupom.pdf
    • https://cdn.shopify.com/s/files/1/0430/2258/1923/files/99090945334.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/15118418803.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3143/files/95110271209.pdf
    • https://cdn.shopify.com/s/files/1/0435/7590/2363/files/zivexalexuwarujed.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_off00007b97.bin
b0ca76d258bba1bbb90be3ec6eb129b07e73ec53c3dc91d3e43a388232855f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B97 5316 bytes
font_01_sfnt_off00008d9a.bin
525cd99878d4d137fe665e315a0487b9124165bc680668ca909b18695119e5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9A 10100 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.