Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88cc42bc7e004fc…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 18:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde2b513b441ae1c18bcb1a9e99f9645 SHA-1: 5302b18b49d35f74d992d4afdb001d3dbe91921c SHA-256: a88cc42bc7e004fc41257583aa6f923aaf50c745221665872d3cf1b802805250
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document appears to be designed to lure users into clicking these links, potentially leading to further malicious content or exploitation. No scripts were extracted, limiting the analysis of direct payload execution.

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=spotting+telescope+buying+guide
    • http://files.reboundmpls.org/uploads/1/3/1/4/131407737/5568345.pdf
    • http://files.worldofspanishllc.com/uploads/1/3/2/6/132682134/68d0380d.pdf
    • http://files.paradigmshiftedu.com/uploads/1/3/0/7/130775448/24705.pdf
    • http://files.thecatholiccandlecompany.com/uploads/1/3/0/8/130813755/25105.pdf
    • http://files.cpcaannualconference.com/uploads/1/3/2/6/132682171/9775224.pdf
    • https://cdn.shopify.com/s/files/1/0436/6997/9289/files/7933061272.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/dream_theater_images_and_words_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0454/3823/8878/files/xiluvuwakanobo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/roll20_change_avatar.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/fiche_de_poste_assistant_comptable.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/adivinanzas_en_ingles_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/gosofekaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/15557515170.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_off00006080.bin
1dd7ffdd685f7c8bbfb9b52481470e56e62055eabf2d849e670b79aa92d0920d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6080 5280 bytes
font_01_sfnt_off0000728a.bin
e5da38b250a341c10eca866452da7a8dfac7168d12a79accfaef80975a6a79c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 9620 bytes