Malicious PDF — malware analysis report

Static analysis result for SHA-256 306b9ff6a87c9903…

MALICIOUS

PDF

42.8 KB Created: 2020-08-22 13:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1409b8a47e8123bc1a91c90282c2854a SHA-1: 577e72e2a6484972007051f7d88b2d852ecba969 SHA-256: 306b9ff6a87c99033ed48bc106ad9d726d8b0bd571ecb73b46a714c6bf351962
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with multiple external links, one of which, 'https://ttraff.com/pify?keyword=employment+insurance+reporting+hours', is identified as a malicious redirector. The document body and embedded links suggest a lure related to employment insurance, aiming to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=employment+insurance+reporting+hours
    • http://files.gladstoneluthiers.com/uploads/1/3/2/8/132814898/delezuzevo_nirilokozeleruv_terenozifamoji_dekufowe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4959/8632/files/nugisefakagub.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/paulo_coelho_alchimistul.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0728/files/how_to_terminate_program_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/condom_size_guide_durex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/kusomalunomivumasalaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/gubuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/1669/8530/files/rudamedon.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5910/files/81589909568.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a32.bin
1abe6d2c0804eb030da3f3a942446eda3151fbd047cd2cc17b1f7686e889d279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 5408 bytes
font_01_sfnt_off00007c74.bin
46c0466ac64b2f62d9d7dccc8be1960712abf7c32768dafe110fcb268d9e8577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C74 10064 bytes

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