Malicious PDF — malware analysis report

Static analysis result for SHA-256 109950331745eac9…

MALICIOUS

PDF

40.5 KB Created: 2020-08-25 05:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94238d84dba42fa57e82bf8600cf849a SHA-1: 9213840b99a4c8702db63d10f14beb55b6cc6e40 SHA-256: 109950331745eac92d01f914869312ac62f5c65b0a0a726b38997ac9d54e0511
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to host phishing content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics suggest a lure to malicious sites.

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=black+background+image
    • http://balovuw.bounceinthehouse.com/uploads/1/3/1/4/131438216/malob_kobeverubu_zinewup.pdf
    • http://files.fiveandafifth.com/uploads/1/3/0/7/130738554/sajep-bimeka.pdf
    • http://nuxifuj.totalem.org/uploads/1/3/0/9/130969352/3528484.pdf
    • http://xasebo.stelizabeth720.org/uploads/1/3/2/7/132741420/5999236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/gidatoludupadeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/vatewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/answering_affidavit_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/bejonobifabatagajigikuzid.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/57254073480.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/60792680073.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/benejawilowavaxavemopate.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/pagumovivozedesoxin.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/34352915228.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6796/files/nutuguforufixasukaso.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_off00006078.bin
947f8defe7e28dfa1d33dcc8045f510d15d479c66afd4af384b230d92925c7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6078 5332 bytes
font_01_sfnt_off0000727a.bin
4c7fc4568f7e2d6694102fc0b5b62edd337817bd87634757c01d226726b4a643
pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 10256 bytes