Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c28af7d8eed5f68…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 07:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 973690d2727f82d8eb345ef528ef39ba SHA-1: 0e81e5964c126af8534f8a7b0ebc1ed23ab00b30 SHA-256: 5c28af7d8eed5f681e1bb4913fbf888b1ba8aed40f205766873d901e86292a03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body also contains a URL that leads to this redirector, which is likely intended to lead the user to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute 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.cc/wix?keyword=devexpress+xtrareport+add+subreport
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8133/4951/files/93663970618.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/absceso_en_la_cara.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/95618246532.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/broward_county_community_service_hours_log_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/49189760612.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/fotozobujuvasojebejusov.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/31967950149.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/highly_composite_numbers_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/vetoboragejawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0710/files/zoripura.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/41298036058.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_off00006710.bin
3a64a3e5dc8d6af2894520b58e73d63d8f2e429c304f92940affcddfa9718ba9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6710 5188 bytes
font_01_sfnt_off000078bf.bin
9add2365d3b7f913e86225714ffcfc838d2a9dad02b9799c7bd4ea99dc87d6a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 9840 bytes