Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd124ff2a85f57e…

MALICIOUS

PDF

35.6 KB Created: 2020-08-22 13:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed0617bedde9b8412369a3f6762f004b SHA-1: 6b649aedd82a8f66e48aedb0f28072955d53443e SHA-256: bdd124ff2a85f57e5afaeaf5602016af8c32c9d104e86d23fdc74abfd2e5ba2c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, suggesting a link farm for SEO manipulation or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though partially corrupted, contains keywords related to 'Ingersoll rand centrifugal compressor manual', indicating a lure to disguise the malicious intent. The ML classifier 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=ingersoll+rand+centrifugal+compressor+manual
    • http://files.pacehighchoir.com/uploads/1/3/1/8/131871891/2056809.pdf
    • http://videvefix.arnoldroad.org/uploads/1/3/0/9/130969260/matofufilom.pdf
    • http://soxivok.boonecreekfarms.com/uploads/1/3/1/4/131408100/zakisaterazume-belosekogeki.pdf
    • http://files.kerenwheeler.com/uploads/1/3/1/4/131453682/momenivarapenab_megotigepad_fozibuto_zagolal.pdf
    • http://files.economicprojects.com/uploads/1/3/1/4/131453998/496f248.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/select_all_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/wumefazuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4455/2354/files/solving_half_life_problems_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/4201/1293/files/83935512778.pdf
    • https://cdn.shopify.com/s/files/1/0434/1733/8005/files/rules_of_jenga.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/mathematics_project_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/vifaju.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1085/files/36058611117.pdf
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/battlefield_bad_company_2_player_count.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/banking_service_chronicle_february_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/posuxaxateziw.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_off00004d88.bin
4a8234b8eee6837fd87050afb55ba0ab904d18d582437afdeabe942d1f97e4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D88 5412 bytes
font_01_sfnt_off00005fda.bin
98eb3a9a6e389d374d45275e8d92a151a49bb4cd200c585cfdd1497b0ac80086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 9780 bytes

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