Malicious PDF — malware analysis report

Static analysis result for SHA-256 1527b9d62e21c8e5…

MALICIOUS

PDF

41.8 KB Created: 2020-08-26 02:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d525a7244279270bee9a2bd8dc48bdeb SHA-1: 45e3e3589b9543f47d47a9989f9497052d84cf3d SHA-256: 1527b9d62e21c8e58ca04b19271b4f7e661d7e21ca27b584a8aed7e4276373eb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination. The document also contains a large number of links to PDF files hosted on Shopify, suggesting a link farm used for SEO poisoning or to host further malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a phishing or redirection attempt.

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.com/pify?keyword=display+scaling+windows+10
    • http://files.cincinnaticorporateyoga.com/uploads/1/3/0/7/130776644/goboza.pdf
    • http://files.continuumsofservice.org/uploads/1/3/0/8/130813526/zarupefekuwogizige.pdf
    • http://wofipele.theexpatspeechie.com/uploads/1/3/1/3/131381241/rofisejeben-gogumefovot-zusuzuwolujenu-foromudovu.pdf
    • http://pesonij.oliveandfinch.ca/uploads/1/3/0/7/130775934/muxurevasuju_joloxutopelaju_ladov_dosuvil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/10625184643.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/27885174760.pdf
    • https://cdn.shopify.com/s/files/1/0440/2796/9686/files/perifavitufokawe.pdf
    • https://cdn.shopify.com/s/files/1/0447/2917/2122/files/section_51_of_cgst_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/zolawuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4003/8298/files/49855987172.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/lunajixawejeviderokigime.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_off00006533.bin
5e8a6993471492b888dea3b0abff6cdd3275c7e0f4c05800d50c508711490d81
pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 5532 bytes
font_01_sfnt_off0000782c.bin
db3f916f77dd4543fb5c47c80a0893ae2074601af968e93514df25dea2c1421a
pdf-font-stream PDF embedded font (sfnt) at offset 0x782C 10080 bytes