Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71c60e4102a1aa5…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 05:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10557bb67300c2373bb866cef03c9a3f SHA-1: 08f9f80445d666545e81f0ee4d20f7bf070ac9d7 SHA-256: a71c60e4102a1aa5ef621f56b4434491d570672569dfd12f53a75c878a6f1e9f
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=energy+transformation+and+conservation+worksheet+answer+key, which is also present in the heuristics. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting a broad distribution attempt.

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=energy+transformation+and+conservation+worksheet+answer+key
    • https://static.usrfiles.com/ugd/b8c837_ffaf3c61f6b24b06917941de46807d89.pdf
    • https://static.usrfiles.com/ugd/e745be_c90973c07045458e9cd8a14dc6663350.pdf
    • https://static.usrfiles.com/ugd/0a593f_2aad88736d69488391253c4b82dde2b6.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_a74b12795f714e3e80cf15dfd1632791.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1e595c142fe4d1aa22bfba95c315d95.pdf
    • https://cdn.shopify.com/s/files/1/0435/0217/4374/files/16229669633.pdf
    • https://cdn.shopify.com/s/files/1/0432/9652/2398/files/xivozipetope.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/54788856513.pdf
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/cargador_de_baterias_truper_manual.pdf
    • https://static.usrfiles.com/ugd/34ec99_21a5551a0eef417eb8a82c71b7690b19.pdf
    • https://static.usrfiles.com/ugd/e4a001_76508b536cd942c48d53a7766db335c2.pdf
    • https://cdn.shopify.com/s/files/1/0432/3750/7240/files/93163142488.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/72109641822.pdf
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/objectives_of_material_requirement_planning.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_off00004c94.bin
5a7d74c42126387d6863a2993ea0501d7f8a4e5dfb68b21ac76648d8cef6d545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C94 5464 bytes
font_01_sfnt_off00005f15.bin
f84626b4a9ed0fcac5327f16de88f262cdc4c860e400548d747b0b2ba4f35fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F15 10324 bytes
font_02_sfnt_off000081c1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C1 4324 bytes

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