Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d1b62ea691f074…

MALICIOUS

PDF

49.7 KB Created: 2020-07-30 07:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 696b7edded22a2b72d93426cd03b66b5 SHA-1: c295393877e121a92d1b36131daac97ff42a0741 SHA-256: 81d1b62ea691f074d0563a4b78142c7baf770469f4d522f2413c719b78bc9517
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, suggests a lure related to 'Adobe after effects tutorials free download pdf'. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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=adobe+after+effects+tutorials+free+download+pdf
    • http://files.brennanthefounder.com/uploads/1/3/0/7/130740174/purunetubumeker.pdf
    • http://files.ktwines.net/uploads/1/3/1/3/131379382/3066026.pdf
    • http://files.melindacochraneauthor.com/uploads/1/3/0/8/130874257/xazivuga-letekikuzitulo.pdf
    • http://files.madanihotelmedan.com/uploads/1/3/1/4/131454090/5448110.pdf
    • http://files.oo-art.com/uploads/1/3/0/7/130738779/gubifexafodomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/konurapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavokalozetaxolemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/pepesabugegepesin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/67113007375.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/wezibonizazarujikarujig.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/duwedumiriwekakidumoreto.pdf
    • https://cdn.shopify.com/s/files/1/0437/9725/0210/files/kiluwasedasezoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/seliv.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/rimipoxetit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/vuxosavejofewaj.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_off0000842e.bin
3c13e8efe00dbc75b991e2e16db368942e30eaed2c57454c3a7e9cfe3f1f4e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x842E 5252 bytes
font_01_sfnt_off00009625.bin
b46c0d687be2340c5197bef61a4df840d352dce2a0c3fda3c952791ce532cd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9625 10388 bytes

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