Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a49bbd6cefd74e…

MALICIOUS

PDF

40.1 KB Created: 2020-08-06 05:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce14693d2b9849a3142a5745ff7ff876 SHA-1: 4da2556c06b71256cc818a093af75b69d22e9fde SHA-256: 98a49bbd6cefd74e40e4d73f7f80098c0312bc10287a45bc9eb88bb064423912
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external websites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of numerous links suggests a link farm or redirection scheme designed to lead users to malicious 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=air+conditioning+principles+and+systems+4th+edition+pdf
    • http://files.vicjuniorxcski.com/uploads/1/3/1/8/131856232/kigoxukipoxupazitela.pdf
    • http://files.phillychildrenshouse.com/uploads/1/3/2/6/132695384/6314595.pdf
    • http://files.conklinstudiopottery.com/uploads/1/3/0/7/130776602/9e45c877b0641.pdf
    • http://files.mobilebirdgrooming.net/uploads/1/3/1/4/131437980/be89a4f17.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2002/files/roxomagetazejatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/46914156717.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/99939461842.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/3m_tape_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/70957209591.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/mamaxefovumapijuremi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/fuwuwiwovejebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5178/6145/files/75705227767.pdf
    • https://cdn.shopify.com/s/files/1/0431/7360/9636/files/28293527709.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/nonuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/76755520674.pdf
    • https://cdn.shopify.com/s/files/1/0435/8458/5883/files/principles_of_macroeconomics_8th_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d7d.bin
3246841bca87ab408f3b05abe8c78273c95038707e0e9ceeb6ceaefe18bfa87e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7D 5748 bytes
font_01_sfnt_off000070ff.bin
76407ce065542b60a2ddb2d71e074f52b8a4e328da6f43bf384ea241a5e4e240		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FF 10052 bytes

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