Malicious PDF — malware analysis report

Static analysis result for SHA-256 04458134a84260ec…

MALICIOUS

PDF

48.7 KB Created: 2020-08-19 01:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c644ab4c1ea764c5a2ea0c4d57f79ed1 SHA-1: b99db7a2206dc128ee44c07c5622d666628328bd SHA-256: 04458134a84260ecb9c4a1a53f5b5869e1f45655dbe17428e4648b63a28e3feb
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous PDF files hosted on various domains, with a primary link pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting an attempt to drive traffic to malicious infrastructure.

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=guideline+pulmonary+embolism
    • http://files.2andahalfcups.com/uploads/1/3/1/4/131453733/dijun_fidafevino.pdf
    • http://files.casa-de-colores.com/uploads/1/3/1/4/131437283/9955421.pdf
    • http://files.artizaninternational.org/uploads/1/3/1/8/131856446/gowusomas_zawigegolanep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/xunomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0524/6631/files/numitenolig.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/biases_in_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/fisiologia_de_la_vejiga_urinaria.pdf
    • https://cdn.shopify.com/s/files/1/0439/2891/2040/files/78069324891.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/koluwasuzelidelel.pdf
    • https://cdn.shopify.com/s/files/1/0428/7198/0198/files/briggs_and_stratton_vanguard_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/7470/6853/files/57477426525.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/ethnographic_method.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006457.bin
c9ffbbdb321f673f943839da99c91e62f0e62646f748985d704a4cec1f870478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6457 5180 bytes
font_01_sfnt_off000075b9.bin
ee3285731637e3ec4cf4d3377ae7406a9ecbb593e905398ce72c0c4d9f8c2bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B9 6172 bytes
font_02_sfnt_off000085bb.bin
0ba7aef33120f8c8058f3e8467a5190065b10faac655b28180792f27ce67e96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BB 9888 bytes
font_03_sfnt_off0000a79b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA79B 4324 bytes

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