Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5676db9e825a59…

MALICIOUS

PDF

51.8 KB Created: 2020-08-03 13:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11595cc7a14028a514618a15fae0455f SHA-1: 07ab18c991831ff5f1b9afcdfff19b54236e27f7 SHA-256: ca5676db9e825a59509633654f84b44640c5be95d68637bc139ea7c1de461ebe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple critical heuristics for linking to known malicious redirector infrastructure and for containing a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a redirector, which is a common technique for phishing or malware delivery. While no scripts were extracted, the PDF structure and URL analysis strongly suggest a malicious intent to redirect users.

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=tecnica+de+asepsia+y+antisepsia+quirurgica+pdf
    • http://files.ladyvetanimalhospital.com/uploads/1/3/1/1/131164260/5b8baf6b4d03d5.pdf
    • http://files.festival-calendar.com/uploads/1/3/0/8/130874380/840b51.pdf
    • http://files.royalmontacademy.org/uploads/1/3/1/3/131380107/a7885f41a98c6.pdf
    • http://files.maakravmaga.com/uploads/1/3/1/4/131483719/bc9610836f45192.pdf
    • http://files.susanvanwagoner.com/uploads/1/3/1/0/131070452/8318724.pdf
    • https://cdn.shopify.com/s/files/1/0431/2753/7828/files/wadokotivekapibajagetem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/xujidebejakaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5370/2550/files/36394515569.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/82741711351.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/zuwudekixumiminapiguf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/vepaxobedubamidiximeku.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/55643107697.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/pofijepilerasememuri.pdf
    • https://cdn.shopify.com/s/files/1/0430/5171/2666/files/72516953503.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/25573351252.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/lodash_vs_ramda.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/81624827597.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/mtd_lawn_tractor.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a86.bin
057d940c57ba713bba2aa555aa237d3b8df55a6cb234f3dd09993ba32b56eaff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A86 5240 bytes
font_01_sfnt_off00008c60.bin
48b6bd3b539edcaffc0bf8945f052b7d1eb75c420e1e636863301b02484a53b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C60 11452 bytes
font_02_sfnt_off0000b188.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB188 4324 bytes

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