Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b969a57be7ba21…

MALICIOUS

PDF

41.6 KB Created: 2020-08-17 18:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce3b49d13f634373bc2f035fddafcba SHA-1: e4f06ed6128b9f6bb7b73aec99565a6cafa560e5 SHA-256: e8b969a57be7ba21a15b742aa9f92cc78f3a0fe87548531ec5f6eb1753cca572
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a phishing or redirection scheme designed to lead the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=cute+smile+baby+images+free
    • http://files.farrellsframeanddesign.com/uploads/1/3/1/4/131452887/1b3c30a616.pdf
    • http://zawup.street-fotografie.co.uk/uploads/1/3/0/7/130740596/fazilemumelekazaru.pdf
    • http://fidax.extonbury.com/uploads/1/3/0/9/130969873/vixuton.pdf
    • http://files.amandagretschot.com/uploads/1/3/0/7/130740465/255637.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/68034246754.pdf
    • https://cdn.shopify.com/s/files/1/0431/9884/0995/files/java_projects_with_source_code_and_documentation_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/81007356441.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9799/files/xajirufibijoratujutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/dogugosumeziwizexovok.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/favuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/mongodb_insert_document.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/vanilla_wow_first_aid_guide_1-_300.pdf
    • https://cdn.shopify.com/s/files/1/0436/0437/7763/files/gejomewazezusen.pdf
    • https://cdn.shopify.com/s/files/1/0430/4302/9143/files/mva_form_dl-_202.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/lorimelimuzupunitu.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_off00005d24.bin
4e7f288a310bf9638a9c7360b59890204c82e06cf1a3ec3dbbc0280a194379fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D24 5236 bytes
font_01_sfnt_off00006ee4.bin
7e47c9be00959f0e30d95df03c17d09b8d06d6a360e4875139ba46a774414401
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 13492 bytes