Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f4179c1240e922…

MALICIOUS

PDF

40.7 KB Created: 2020-11-03 04:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04ce3d1cb5ed77cde3a3b3c41454b5a SHA-1: bcb42a3c207128f11c0578545a65abe82c377e88 SHA-256: 32f4179c1240e922012f3ccca36735fae3aaa7f7d84d315780b995f5d83beb17
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body and embedded links suggest a lure related to calendars, likely intended to trick users into clicking through to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains a mass of external links, indicative of SEO poisoning or link farming for malicious purposes.

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://gettraff.ru/123?keyword=calendar+for+2019+2020+2021
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/wubimevipuwepi-podop.pdf
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f9caabb77b3c.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/rukazo.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8a9333d6c72.pdf
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/7348064.pdf
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f91b94c2a972.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8a183db7ffc.pdf
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f9a69a449234.pdf
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/8481807.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0483/1864/4379/files/kuwawotabetazenat.pdf
    • https://cdn.shopify.com/s/files/1/0498/9403/1516/files/sesisubodowal.pdf
    • https://s3.amazonaws.com/piradi/lakuwibilabekikexuk.pdf
    • https://cdn.shopify.com/s/files/1/0502/0866/9872/files/8574502775.pdf
    • https://cdn.shopify.com/s/files/1/0481/2796/7395/files/wupezakotute.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_off000061ce.bin
fc96aa20caf2fb5cc3643e259f6cbf00e512f93a7f9eb811c8779af42eb5a340
pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 5112 bytes
font_01_sfnt_off0000733e.bin
d11ae76bb2f8b8b50abc0834c096b670ad0905f4fe163ceba3040875cecbeb66
pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 10200 bytes