Malicious PDF — malware analysis report

Static analysis result for SHA-256 628527ba42cdba37…

MALICIOUS

PDF

41.7 KB Created: 2020-07-30 09:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3459ffa0c2de14d20d134bd39d1da5a9 SHA-1: 6bb7b33a90b0df52434184e4485d78705ccfbc2a SHA-256: 628527ba42cdba37748136e4b550405a39cb48d0d624b13f28fbfe8271e4c0d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search results or distribute malicious content. 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=blank+pictograph+pdf
    • http://files.harrishomeopathy.com/uploads/1/3/2/6/132695633/46d872b50395702.pdf
    • http://files.workwithstandout.com/uploads/1/3/1/6/131637385/vilirizafomoxet-gokurufodawukag.pdf
    • http://files.wasga.org/uploads/1/3/0/8/130814187/debogojotot.pdf
    • http://files.emeralddrivena.org/uploads/1/3/1/4/131453817/raronodizaxunew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/siliranapizonovojupezuweb.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7698/files/2521895239.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/75463769800.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/bijenoforenukevutuzabuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/lanelijep.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/99549054025.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/nekodanozibufimotagogolel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/dapuzokowoxugesagejo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/zemug.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/xipev.pdf
    • https://cdn.shopify.com/s/files/1/0440/1741/8405/files/3868506023.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/jilukidoputewijin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/govowokabojoxasuga.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_off00006679.bin
5630a652ee0120d839ff5ac1ba03ec0e46da71c701b613a136ba92bc7a019efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6679 5020 bytes
font_01_sfnt_off00007775.bin
ce5999e15912c7083c28ab3768609e015dd0ecee3a43139b56cf7eca8c9172e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 10132 bytes

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