Malicious PDF — malware analysis report

Static analysis result for SHA-256 43833722f7b5e760…

MALICIOUS

PDF

44.3 KB Created: 2020-08-23 13:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eca796afe07ca63f7c8060cb86eb45d4 SHA-1: b5ece663369ffe47832d3e8a6429ab4d4e61f6a0 SHA-256: 43833722f7b5e7601f035b575b59565a600189ceed18b7c3930c045faf17a0d8
154 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=biomes+concept+map+answer+key+biology+corner', suggesting a lure related to educational content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of this URL. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates the presence of numerous external links, many pointing to Shopify, which is often used to host benign files but in this context likely serves to obscure the malicious redirector. No scripts were extracted from this sample.

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=biomes+concept+map+answer+key+biology+corner
    • http://pafux.etobelarusdetka.com/uploads/1/3/1/1/131164250/4058573.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/equations_with_variables_on_both_sides_practice.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/centro_de_convenciones_programa_arquitectonico.pdf
    • https://cdn.shopify.com/s/files/1/0436/0486/9277/files/bonovunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3948/2275/files/wizards_unite_apk_4pda.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/zumadavupasufagagemizak.pdf
    • https://cdn.shopify.com/s/files/1/0430/8605/3527/files/fanibiforuzixudube.pdf
    • https://cdn.shopify.com/s/files/1/0462/9882/4864/files/58551410408.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2773/files/63765499274.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/tidefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/maths_formulas.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_off00007024.bin
5d4f51b69e8b43ceff04ecbe30f830a8f4f1b179df83efc6592a40eced583fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7024 5700 bytes
font_01_sfnt_off0000838f.bin
fee3a3170ca3ff47147cdca79394f502529b9887e149b65d49b333cb2d7fa377
pdf-font-stream PDF embedded font (sfnt) at offset 0x838F 9580 bytes