Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b441819ac6f3446…

MALICIOUS

PDF

38.9 KB Created: 2020-08-26 07:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b7788232298998ab2c8de1fabfd4eb SHA-1: 216de2f053bc2aec9146847677c6d8661420ec9b SHA-256: 9b441819ac6f3446814a1a53c9dc3923a52710d97b6aebb58a995f2679f5b6a1
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a large number of external links, forming a link farm. One of the embedded links, 'https://ttraff.cc/pify?keyword=blue+chicken+stardew+valley', points to known malicious redirector infrastructure. The document body is heavily obfuscated and contains some of the same URLs, suggesting a coordinated effort to distribute spam or malicious content.

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=blue+chicken+stardew+valley
    • http://lamoj.amayagolf.com/uploads/1/3/2/3/132303382/roxupikiz-riwalopigug.pdf
    • http://files.konidarissales.com/uploads/1/3/2/7/132740463/firepakef.pdf
    • http://files.axsbeta.org/uploads/1/3/0/7/130775551/nopugerurateri_fedugumeninaxi.pdf
    • http://files.dustinnowlin.com/uploads/1/3/0/7/130776089/sasojabozibebazibano.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/agri_fab_lawn_vacuums.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8134/files/velipidil.pdf
    • https://cdn.shopify.com/s/files/1/0445/2705/9103/files/6th_grade_daily_math_practice.pdf
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/85933336102.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/ectomorph_workout.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/pedagogy_of_biological_science_tnteu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1557/5464/files/gufevupodurenovogogabir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/53732336429.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/78023632196.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/19587188239.pdf
    • https://cdn.shopify.com/s/files/1/0436/3363/9584/files/47325960687.pdf
    • https://cdn.shopify.com/s/files/1/0436/9216/3227/files/9910637055.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/introduction_to_functional_grammar_halliday.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_off0000598a.bin
c1ec6fde55a773adaebc8f011bb39ed2b1678520482676719d11e4784ca6cbfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598A 5392 bytes
font_01_sfnt_off00006bf2.bin
43f4c9d38a1f018d95344c5d6eae62394e520e8d105032d0bbaa42af1a175a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF2 10180 bytes

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