Malicious PDF — malware analysis report

Static analysis result for SHA-256 081c4acd937630d5…

MALICIOUS

PDF

34.2 KB Created: 2020-08-04 14:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa846bdca790cecb988275aa48baed4b SHA-1: be09cf33d81a80e1caf6bda1c90c84be47fa6b29 SHA-256: 081c4acd937630d5efc401b81b115854ff70f4e2d3cb2a22d11180a703d85ca0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, contains text that appears to be part of a lure. The presence of a malicious redirector and a link farm suggests an attempt to lead users to malicious sites, likely for phishing or malware delivery.

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/pify?keyword=apostrophe+activity+pdf
    • http://files.synergy-rhodes.com/uploads/1/3/1/4/131453086/bb5969de8fe5.pdf
    • http://files.andreascustomcakes.com/uploads/1/3/1/3/131398129/820025b4a6fa.pdf
    • http://files.drloblaw.com/uploads/1/3/1/4/131407164/kikajigo_firerejakikavuv_sasosu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/12224330922.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/51666829906.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8423/files/sri_rudram_namakam_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/bizenupoxipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/bases_de_datos_en_excel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/sokevejazididofozaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6097/6021/files/34320505137.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/54322576791.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/13837528550.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/vipovim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/safamajufubidozejura.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/87087086976.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_off000048b9.bin
654033d37272f245641fe94eb8c39bf48a1fe9433d0f26d8a9679a0019e5eba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x48B9 5364 bytes
font_01_sfnt_off00005aff.bin
2853471348ca6703eb6a5ebc0be822c10dc568e572de1a4577f7bd23dd1be5ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFF 9680 bytes