Malicious PDF — malware analysis report

Static analysis result for SHA-256 02acc4336c1a41f9…

MALICIOUS

PDF

39.1 KB Created: 2020-08-24 20:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1d7262d35d0d23cefae00d00fff20e3 SHA-1: 84782df5bfe873ab5aaf46d6f912bb6ef652c5f5 SHA-256: 02acc4336c1a41f94d366dab2d8f46dd4ec515b810d0e8597607edc403513ae6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'aquaculture pdf book' and a URL that aligns with the heuristic findings. The primary malicious URL identified is ttraff.com, which is flagged as a redirector. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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=aquaculture+pdf+book
    • http://reliku.inspiredturquoisetack.com/uploads/1/3/0/9/130969723/02f2a71a.pdf
    • http://files.photography-timeless.com/uploads/1/3/1/8/131871745/pasego.pdf
    • http://files.abaautismservicescentralwest.com/uploads/1/3/1/4/131437311/januratibofapigazir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/amines_class_12_ncert_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/8350807533.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/6321168752.pdf
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/delta_sigma_theta_membership_intake_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/nofurekevikiruduliledejum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/46729708442.pdf
    • https://cdn.shopify.com/s/files/1/0430/6265/7177/files/chava_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/circus_cartoon_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/6784573562.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_off00005a97.bin
fc87261a363062c37512d4754c321453ce9d69e3f2bf8ded03760b42777e13bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A97 5292 bytes
font_01_sfnt_off00006c9c.bin
03e4dcddbcefe8e1b2f1efb777f3c2901fabc24c074220de20dbd5ab7e0fd52a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9C 10320 bytes

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