Malicious PDF — malware analysis report

Static analysis result for SHA-256 53471302dd95fa76…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 19:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27a349feb2b655859372bd3fc99f449 SHA-1: 7cb519bb893abd18cf7e9e8dd23885ee1dec52c5 SHA-256: 53471302dd95fa7646df5cde86647604498856f475142b1ac2ea80fcba40a0dc
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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=anemia+falciforme+genetica+pdf
    • http://files.kapanshipman.com/uploads/1/3/0/7/130740258/ee7f97.pdf
    • http://files.northbranchwoodworking.com/uploads/1/3/2/6/132682607/8700529.pdf
    • http://files.selffound.net/uploads/1/3/0/7/130775490/xokavimodob.pdf
    • https://cdn.shopify.com/s/files/1/0428/7257/0012/files/5596300657.pdf
    • https://cdn.shopify.com/s/files/1/0436/4868/0089/files/benefits_of_exception_handling_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/debodenawiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1853/files/harmonized_tariff_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/42182521804.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/xirifitawuganudododa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6207/4261/files/94752506670.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/9037741123.pdf
    • https://cdn.shopify.com/s/files/1/0430/5023/8101/files/14122042502.pdf
    • https://cdn.shopify.com/s/files/1/0429/2427/7923/files/jetiremasikijexefirome.pdf
    • https://cdn.shopify.com/s/files/1/0428/8449/7575/files/54608079625.pdf
    • https://cdn.shopify.com/s/files/1/0435/5126/0823/files/wakumesibodenekapafuxomun.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_off00006af3.bin
b18ec1f4ed6974b9a110aeef40334d91bc7debf1b3ce06822dc31b4e1f3581c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF3 5284 bytes
font_01_sfnt_off00007cd2.bin
eed602a7325e843232a6a54ec5a183cb59fa01776e4b789709dbf4ad49c71102
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD2 10664 bytes