Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf40545d4f189eb…

MALICIOUS

PDF

44.3 KB Created: 2020-08-15 22:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 334e27d23176fd3040265bf7f129e719 SHA-1: 65dccc582e05962ddc466e940aa078f41d8be64e SHA-256: caf40545d4f189eb54f610c5dc13364d265d0900d13623d9194b18eebc58eb63
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to a 'British cinematographer magazine pdf' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm further supports this. 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=british+cinematographer+magazine+pdf
    • http://files.jqbrattonmedia.com/uploads/1/3/1/3/131380083/mifez-fenijir-semokaletak-vefaxomadoripa.pdf
    • http://jasej.bungendorepreschool.com/uploads/1/3/1/1/131164250/488330.pdf
    • http://sokex.wflta.com/uploads/1/3/0/7/130775291/sotovakamifalifu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/95217249711.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/samsung_tv_catalogue_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/37217339575.pdf
    • https://cdn.shopify.com/s/files/1/0449/7843/8302/files/balanced_cantilever_method.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/29645162863.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/13887795226.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/abnormal_psychology_an_integrative_approach_5th_canadian_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/nakoruwuzekivekuzozomevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/mizo_customary_law.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/xizutetitomoviginuke.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/d_d_3._5e_monster_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d5.bin
a0236e87d58c34cff31a182f2404035672ab3c8f1eff37adb0ffb79324cd2262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D5 5636 bytes
font_01_sfnt_off000074d2.bin
cb03acd017500927988b7e50e495582682f6c23237ddc20251056c6592ca1707		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D2 2744 bytes
font_02_sfnt_off0000807e.bin
ede7f5cfe99febaf361578af8b02a79a9a57f90db69e4e8acc5800187b9089f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807E 10364 bytes

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