Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae7d2f9abd9ae4b…

MALICIOUS

PDF

45.4 KB Created: 2020-08-11 15:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5a47510b952ce613164cb98793cdaa6 SHA-1: 83ea813caead6c4fd8e5f765b231122116606224 SHA-256: 9ae7d2f9abd9ae4b69369bb0ad4a1409cdf3389cd9e42adbdb5fef659b004ea4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=system+administrator+in+linux+pdf'. The document body, though heavily obfuscated, contains this URL and appears to be a lure disguised as a technical document. The presence of a link farm and the ML classifier's high confidence further support the malicious classification. The primary attack vector is likely directing users to malicious infrastructure via these links.

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.ru/pify?keyword=system+administrator+in+linux+pdf
    • http://zaniva.stdavidscarrmill.org/uploads/1/3/2/6/132682646/15ddd77c1b741.pdf
    • http://files.terrymcgrawphotography.com/uploads/1/3/1/3/131398182/6319721.pdf
    • http://files.belleandbeaucompany.com/uploads/1/3/1/1/131163667/b981639701c2062.pdf
    • http://files.dentontannerinsurance.com/uploads/1/3/0/7/130739715/mopixemosi-wobusi-letizazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/44745718888.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/85564620254.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/zidukudadefazuvuxetanuzaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3463/9522/files/97564971008.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/characteristics_of_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/all_about_space_issue_70.pdf
    • https://cdn.shopify.com/s/files/1/0428/9065/7951/files/fupugerudenepisativumijoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0944/files/pdf_file_converter_autocad_drawing_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3654/files/noxobidawebezet.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/18341727443.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/29739269605.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/ludobemorigoze.pdf
    • https://cdn.shopify.com/s/files/1/0439/1138/1147/files/.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2558/files/wekubipil.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_off00006b0f.bin
ec6acbbcc4354e230b21a15f9f194d5784440c7d1f6526a5fce68d3334708984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 5460 bytes
font_01_sfnt_off00007d93.bin
0d362a2766dc3486efd493396a3fd8e9519beb967af2ea9ae78c05711c8f8eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D93 12760 bytes

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