Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a28a6f72ba2d3d…

MALICIOUS

PDF

45.8 KB Created: 2020-08-14 17:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fea5af0839b8587ac90a275c26bc1d9 SHA-1: a89af0d215fc4e643ec50135f6722a7911316cb2 SHA-256: 21a28a6f72ba2d3d78c16e1e59c3e191c21ac2c6e90cd9034be8d0acb679face
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to Shopify-hosted PDF files. The primary malicious URL identified is https://ttraff.ru/pify?keyword=ars+poetica+macleish+pdf, which likely serves as a gateway to further malicious content or phishing pages.

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=ars+poetica+macleish+pdf
    • http://momiwoten.odysseyandabroad.com/uploads/1/3/1/4/131453723/58a525115.pdf
    • http://files.bmwenthusiast.ca/uploads/1/3/1/6/131606756/fejegunojive-zuzapaz-motakirokerovos.pdf
    • http://files.theceramicsartsstudio.com/uploads/1/3/2/6/132696104/nofawowil_mapusebafak_zusawajele.pdf
    • http://files.gimmethelodown.com/uploads/1/3/0/7/130738993/8dd6dd.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/23097528876.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/rifezigexisodoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4256/files/bartlett_1932_war_of_the_ghosts_study.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/fabemofage.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/pidasivamoginevadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0056/8736/files/aashto_lrfd_2020_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0447/2084/9050/files/how_to_annotates_in_evernote.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/berliner_platz_3_neu_testheft_mit_prfungsvorbereitung.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/69514606689.pdf
    • https://cdn.shopify.com/s/files/1/0429/4528/2214/files/control_panel_wiring_guidelines_uk.pdf
    • https://cdn.shopify.com/s/files/1/0440/3753/7942/files/bob_credit_card_application_form.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_off00006857.bin
5f00589ec9a5944c9f7401249dde08bd90238799a19c22d58740fc8bb12f147e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6857 5064 bytes
font_01_sfnt_off00007986.bin
740226f3491249474ae7e86b02e5c7e6455ba4f82f7182980dce961cc9d17d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7986 10084 bytes
font_02_sfnt_off00009bc0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC0 4324 bytes

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