Malicious PDF — malware analysis report

Static analysis result for SHA-256 152698fef6b7ac27…

MALICIOUS

PDF

71.7 KB Created: 2020-08-19 13:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 740d52274d8099ef5e33e498ddb6fbd9 SHA-1: 2ad0c598a201b5d26a00b90c87f0efc1923476d8 SHA-256: 152698fef6b7ac27f7229550bc8443080b2871523b362b9e33fc9d7a4e65936b
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, though heavily obfuscated, contains the URL which is likely intended to trick the user into downloading further 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/pify?keyword=labour+force+survey+report+2016
    • http://files.whisperwindaussies.com/uploads/1/3/1/4/131410870/kakaxivono.pdf
    • http://noxaruje.olgaandflo.co.uk/uploads/1/3/1/3/131379530/4149409.pdf
    • http://kepomoko.iacela.com/uploads/1/3/1/4/131437402/422b40f5b9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/pumixun.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/fedeworizewisunese.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/73595696047.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/pefamalukeba.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7735/files/74778054748.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/git_sparse_checkout.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/33909485951.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/dapowulokuno.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/probability_sampling_journal.pdf
    • https://cdn.shopify.com/s/files/1/0429/4325/0588/files/benozexufarif.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/curves_cancellation_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/29582241748.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/67058040023.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/kelajase.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_off0000cee4.bin
84d5c1f41a802dc41023e66268805e1671474ac6e444f8115cee0b4982a6180a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 5700 bytes
font_01_sfnt_off0000e273.bin
9fdd8c7f7ad9adee70aa66d6f7a33738559f48d420c37b7f8c254e7ed0381462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 15236 bytes

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