Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b3560edc7f636e…

MALICIOUS

PDF

59.5 KB Created: 2020-08-29 16:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88518adad1453e1fb4afda07d6154c99 SHA-1: 9126b16ab5302a2f06c0dc7d12d251e2e258e85a SHA-256: 63b3560edc7f636e7baca7ff78ac13aa88664114e6f4ddf2ee912a2624bd1f9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body itself is heavily obfuscated but contains the same URL as the redirector, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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=bacteriolog%25C3%2583%25C2%25ADa+general+principios+y
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/radial_engine_assembly_catia.pdf
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/job_interview_vocabulary_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/31707567037.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/gezasixof.pdf
    • https://cdn.shopify.com/s/files/1/0446/6468/4697/files/agile_project_management_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/fzmovies._net_fast_and_furious_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9751/files/wigipuwaxajoxeposesebikel.pdf
    • https://static.usrfiles.com/ugd/b8c837_b51795bc29d74f6b85257fac066f8e03.pdf
    • https://static.usrfiles.com/ugd/b8c837_a74ee7a4a4634f53bebacecd2b2037c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_748595b44b634482ad4210d496bfe28b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b11fb9b6e82542b783bc017fea5d10af.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8529f23e5684facae91fdc610ea223f.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb3f081d440445e785ead5b9b7aed636.pdf
    • https://static.usrfiles.com/ugd/b8c837_554b718d21e64b4bb6c1b8ed6733f9f6.pdf
    • https://static.usrfiles.com/ugd/ecec20_445ee57b2049430590ae1c61db8a4870.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b1a.bin
42c5ba40270998504aeb60cc02dd731c831d5954869aff97d7e1c1e184b05b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1A 5240 bytes
font_01_sfnt_off0000acf7.bin
3ddeade14adf231d2e061623a999cc9a1d83d29b580458f9ab2b6481efe58806		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACF7 10492 bytes
font_02_sfnt_off0000d0d7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 4324 bytes

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