Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e721843579424f2…

MALICIOUS

PDF

51.9 KB Created: 2020-08-31 11:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b07467171b24178ce1df84ec0ffec99 SHA-1: dd0027af89db9f94fec5f2def44527166bbc9056 SHA-256: 5e721843579424f2182a114d4f09f1f41df0a48c7d6d52a33ded60092999b86a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classification and heuristics indicating it's a redirector link and part of a link farm. It contains numerous embedded URLs, with one pointing to a known malicious redirector and others to Shopify-hosted PDFs. The document body is heavily obfuscated but contains the malicious URL.

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/wix?keyword=ojos+grandes+dibujo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9721/1558/files/statutory_warranty_deed_form_washington_state.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/bluegrass_energy_outage_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/31761601144.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/bezinubutijogajituge.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/5hp_honda_outboard_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/rudaladaxopivuxive.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/livesisaf.pdf
    • https://cdn.shopify.com/s/files/1/0469/0273/9104/files/simple_present_and_past_passive_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7680/files/zobonope.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/automobile_engineering_interview_question_answer.pdf
    • https://cdn.shopify.com/s/files/1/0435/4061/1226/files/69157254920.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/jiwolaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/veep_pilot.pdf
    • https://static.usrfiles.com/ugd/b48b60_47e928b6e04a481d87c49a1b9e8a565f.pdf
    • https://static.usrfiles.com/ugd/55f640_b1c3d58e0e2c40d8b30654e36b6331ee.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_8eb230fd84294c78a57a0852d8c2f20b.pdf
    • https://static.usrfiles.com/ugd/47b1e8_a1584c6cfab54a0d94b1a42c358b34a8.pdf
    • https://static.usrfiles.com/ugd/c1615c_fe699427046341f691378f9abdadf098.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_off00008dc6.bin
11b03ad5bc0099226d86809ef83bc58d3e58a3716451bf346bd71723988adaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC6 5204 bytes
font_01_sfnt_off00009f7f.bin
7189a0ec6ed78e0b4d76a8d30548394cc8894457ab5d114254fafc7d0e04c8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7F 10712 bytes

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