Malicious PDF — malware analysis report

Static analysis result for SHA-256 118749accac040c0…

MALICIOUS

PDF

32.5 KB Created: 2020-08-23 11:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bcade6fad3ea2d3ac56d145c11a21a5 SHA-1: a9e3aa8b540b3f59239fc1e71b4392ae355689a7 SHA-256: 118749accac040c0e55ec88be3d98e5ed724d013a10ce9d0ffcbb3b399982221
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a malicious redirector, disguised as a grammar test. It also features a large number of links to other PDFs, likely for SEO manipulation or to obscure malicious activity. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead users to harmful content.

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=basic+grammar+placement+test+pdf
    • http://files.pjpexotics.co.nz/uploads/1/3/1/3/131398250/visisuve-nojelomawak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/betaflight_f4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8726/files/18841080392.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1400/files/cardiac_rehab_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/6562/2184/files/84158220030.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/creative_process_in_gestalt_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71135401618.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/auto_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7471/files/desipimiwusixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/winaretikikopase.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_off000041da.bin
4528967a0ab774fa0445281d38aea36d96b4133d7563828271abea416bd51610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41DA 5524 bytes
font_01_sfnt_off00005485.bin
1e1a0b38b22f366d1386642959d548e9eaf858034c580f6c3a11f8d439ef54e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5485 9680 bytes

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