Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc93c94d4f54d821…

MALICIOUS

PDF

53.5 KB Created: 2020-07-30 16:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce1f865386802e215f001767dff69f15 SHA-1: 26f6cc6fa3863ff53c4ef1c3929961ba379a6f54 SHA-256: dc93c94d4f54d821d02de6a7fcfaaca915ac39dea7ed03a887acf57af0be28e2
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, with many pointing to a redirector. The document body, though heavily obfuscated, suggests it is presented as an educational worksheet. The primary malicious URL identified is ttraff.ru, which is used to redirect to other potentially malicious sites.

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=corresponding+alternate+and+co+interior+angles+worksheet+pdf
    • http://files.cathyseversonart.com/uploads/1/3/2/7/132712332/jipetumejarota.pdf
    • http://files.kingstonchamberchoir.ca/uploads/1/3/1/4/131453536/36a41c268a.pdf
    • http://files.jadsys.com/uploads/1/3/2/8/132814050/nisegebetogusejidu.pdf
    • http://files.sineadwhite.com/uploads/1/3/2/6/132682585/mekix.pdf
    • http://files.oxfordmomsandtots.com/uploads/1/3/0/8/130873872/90b02.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/poruvokarigoxevevowizatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikosimuzewenox.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/damexotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/pisopom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/kemunevedubepivufijidub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/dedevixezodu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/tosedadivowafisat.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/86923836614.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/33583517637.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/15210026498.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/28456916616.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/28355255315.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0433/2139/3320/files/betigatetes.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_off0000931e.bin
76b12a86d54ee8823302d9abf25a3a6842d8d6284540a15e143e830b221f7a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x931E 5384 bytes
font_01_sfnt_off0000a576.bin
3446b684eb4e5ced564e23edd75e1bc40a41d513f36e269b589c0b5d898387b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA576 10120 bytes

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