Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fbb9a52891504e…

MALICIOUS

PDF

54.0 KB Created: 2020-08-07 09:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67c816b7a2b2abfcb6f0edb94eaa3de0 SHA-1: 4de8a745c4eaf76d2703afe1e10ee69bbd659290 SHA-256: 04fbb9a52891504e5b871a8255307ae7d2ec99f44bf2f56b284c9593ccde5b15
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 of which point to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding and presentation of these malicious links.

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.cc/pify?keyword=authoritarianism+definition+pdf
    • http://files.bluecruiseturkeytours.com/uploads/1/3/1/3/131384249/mirazasaxidaxugux.pdf
    • http://files.iaqinspect.com/uploads/1/3/1/4/131438501/zefemimozojaxis-satuwuwaxiruzas-zalukifodig-lageranejenaji.pdf
    • http://files.thesportdome.net/uploads/1/3/1/4/131453998/2ecc546388dc09d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/jutagawogalalexozer.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4199/files/nuxexalimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/divurudaxokumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/theileria_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/62425755300.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/case_study_approach.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96258555683.pdf
    • https://cdn.shopify.com/s/files/1/0435/2131/0880/files/fuliw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/tales_of_vesperia_sunken_grotto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089ba.bin
9789835b8b56848b7cfb0c151a1cc2b60bffd5f05a6ca34e27f0dee6068c26a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x89BA 5120 bytes
font_01_sfnt_off00009aef.bin
e33001cbad88bd6e06115b03481c5809618c3bfcc05a0149cd826930516166ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEF 9980 bytes
font_02_sfnt_off0000bd0a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0A 4324 bytes