Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce65a8bc45bd2a1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-07 20:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b88117e12587e5b779b9a65f98be3c14 SHA-1: d51420c04453a8728b7e3490ec6df61672739a66 SHA-256: 4ce65a8bc45bd2a1e1b6561db9153972d6d5adcf4b13c9967e64f7352a2abae2
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=naming+alkyl+halides+worksheet+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. No scripts were extracted, and the PDF structure itself is the delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=naming+alkyl+halides+worksheet+pdf
    • http://files.tornadof3.info/uploads/1/3/1/8/131859370/1c6014b3a.pdf
    • http://files.hilarymccarthyart.com/uploads/1/3/0/9/130968985/dbc14a2fc0adf.pdf
    • http://files.tatescreekpetsitting.com/uploads/1/3/0/7/130739084/87901d4f4c38cc.pdf
    • http://files.acorncookies.com/uploads/1/3/1/1/131164442/samukelodabaz.pdf
    • http://files.freerangebird.org/uploads/1/3/0/7/130776490/xajisokimik_midopafimup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/20209067248.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/bizirixogulagiralojip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/simodogodamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/zinemonujovesibosi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5131/7408/files/447152694.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/61750048637.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/78013535219.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/31916441322.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/classic_human_anatomy_valerie_winslow_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/rewrite_the_following_sentences_that_keep_the_same_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/vegemirigonotin.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/40._717514_73._998139.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_off000063f1.bin
93d7cb929fe59c4ed95aa3eac672a48bdb79845d818f8f53fa798b316d34c129
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F1 5680 bytes
font_01_sfnt_off00007744.bin
a57cdbf6d4fcff536c439e037bfdc3add88af5624d05885555987624a245ae8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7744 12104 bytes