Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c66c42c87bc3ee…

MALICIOUS

PDF

66.5 KB Created: 2020-08-18 17:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfe4cd3d7d94344b647315375e7786df SHA-1: 90e304d18d053f1e01a02b3b547e25d9003cf093 SHA-256: 41c66c42c87bc3ee92480e43519ff90f5d1687f86209552140a55f1eda423760
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the target URL. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a link farm or spamming operation.

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=factoring+trinomials+worksheet+common+core
    • http://files.johnbeswickfurniture.net/uploads/1/3/2/8/132815343/083ae4.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/free_form_filler_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/jovejet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/sepeninusodetefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/audition_form_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4498/6262/files/create_virtual_environment_python_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/30574246022.pdf
    • https://cdn.shopify.com/s/files/1/0435/1485/5583/files/real_estate_brochure_design_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/kovezemos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/hanuman_songs_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/types_of_advertising_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/33186526761.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/invoice_template_html_jquery.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_off0000c72f.bin
f7b854a0291d04efc57c7fe00bad4e5da7669b81611fc4baa386971ad0db7696
pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 5324 bytes
font_01_sfnt_off0000d932.bin
3c68b4ae33b1a881e7535fce14d192a523d5d8968b6e319a99b3695978133786
pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 10864 bytes