Malicious PDF — malware analysis report

Static analysis result for SHA-256 04adfbb90061e91f…

MALICIOUS

PDF

41.7 KB Created: 2020-08-13 00:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b59b74589ec8f12868e164c1b8630a46 SHA-1: b37729e031d290eba79c00edcac767e486aafd58 SHA-256: 04adfbb90061e91ff64a501a62a26d5bf5d1e2a675f5a905f8d71de82a1d71ac
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download a book, which is a common social engineering tactic. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=princeton+review+s+cracking+the+gre+mathematics+subject+test+pdf
    • http://kixabu.seviercountysped.com/uploads/1/3/1/4/131438464/3063931.pdf
    • http://tezebaja.chicinthewoods.com/uploads/1/3/1/4/131482952/wivagoxone_ronemi_gatenuja.pdf
    • http://gozekat.lcoproductions.net/uploads/1/3/2/7/132712207/6880902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0430/1586/4473/files/atomic_and_molecular_spectra_by_rajkumar_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/painting_tau_skin.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/wufanoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/38267281785.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/10115768411.pdf
    • https://cdn.shopify.com/s/files/1/0431/7125/0335/files/tarepuzoxobexomis.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/65216529449.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/pain_train_tf2.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/zanavijupasobozurob.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/17343614810.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/38807467522.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_off000055c4.bin
56525af4b12f758585424daa7e8391e8ef58e4b509c0e5ab8677489885eaa177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C4 5852 bytes
font_01_sfnt_off00006989.bin
b09f763b895ba714d2be87aafcbb8031583c09257f08b7384278d53e43937907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6989 9784 bytes
font_02_sfnt_off00008b02.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B02 4324 bytes

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