Malicious PDF — malware analysis report

Static analysis result for SHA-256 744372b0ad536968…

MALICIOUS

PDF

37.3 KB Created: 2020-08-17 03:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5794021bd9aceb63ed4ad52cbab02d88 SHA-1: d83644c7eacf025956d0f5064e1ff2ea4a88a619 SHA-256: 744372b0ad536968ebaf68fc05277547c2efe428368e920e4fe3b6ea85945a15
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, which is indicative of a link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest an attempt to manipulate search engine results or lead users to malicious content.

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=ashabi+uhud+pdf
    • http://files.lifestylefaceandbodycare.co.uk/uploads/1/3/1/3/131379844/mufopinebafexej.pdf
    • http://nujob.bullsbard.com/uploads/1/3/0/7/130775484/rigejotarigaku-xiridukamokise-nidezazav-pavadimi.pdf
    • http://files.localeyeonline.com/uploads/1/3/1/4/131406105/479db89720aa2.pdf
    • http://files.stdamianeclc.com/uploads/1/3/0/7/130775016/kexefamiba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/tibeku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/fazoxevejaparafazosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/10196083964.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/kenmore_mini_ultra_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/star_fleet_technical_manual_1975.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/business_model_canvas_empty.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/nusupipexirida.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/residential_load_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/45591587214.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/91366328831.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_off00005545.bin
3726b640eeec043959d36565d017eb597930a09d97da138f5eb368932a872df1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5545 5128 bytes
font_01_sfnt_off000066aa.bin
466a1602110fb04b5ce83f1d8e0834b3b03c743a82e4a7c140ee2b728e407a98
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AA 10040 bytes