Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dc6548823d199f…

MALICIOUS

PDF

56.8 KB Created: 2020-08-09 03:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e5eb257228115f8857fc68e74b971da SHA-1: 09d63f0ed5266948204296df8fe33f016d1822fb SHA-256: 82dc6548823d199fdadc6247acdb08e6e38cf4d51b174a15e6af018d03deb924
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting an attempt to direct users to malicious infrastructure. No scripts were extracted from this sample.

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=footprints+in+the+sand+poem+pdf
    • http://files.saintclairstorage.com/uploads/1/3/0/7/130776712/7a1297a2385c.pdf
    • http://files.pineforestanimalclinic.com/uploads/1/3/2/3/132302716/xijofili_jifilizikovaw.pdf
    • http://files.hannahschenk.com/uploads/1/3/0/7/130738548/rexope.pdf
    • http://files.sanbrunodogobedienceschool.com/uploads/1/3/1/3/131384407/6babbb79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/28020487416.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5522/files/evanescence_synthesis_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/6411/4843/files/free_fillable_cms_1500_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/27714512733.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/jijutuniririlujef.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/wurolujigubironug.pdf
    • https://cdn.shopify.com/s/files/1/0454/8378/6392/files/woolworths_food_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/3274/7927/files/livro_de_auditoria_externa_em.pdf
    • https://cdn.shopify.com/s/files/1/0430/2641/5779/files/naturally_thin_bethenny_frankel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/85529382777.pdf
    • https://cdn.shopify.com/s/files/1/0430/2022/2627/files/skyrim_crash_fixes.pdf
    • https://cdn.shopify.com/s/files/1/0440/1112/6942/files/centralised_air_conditioning_system.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_off0000a162.bin
2317cd7bbe67f6026edc91066e72f749c4c22e37c86d0d4b4acbe1426c805b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA162 5204 bytes
font_01_sfnt_off0000b2ec.bin
e20e8666c1e465630e5b9370572241c57811ea5cd27e6d9bbc0498306bd64648		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EC 10292 bytes

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