Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d092ba281ddc330…

MALICIOUS

PDF

48.8 KB Created: 2020-08-11 12:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095a8d082782d00b3a73a7551fd7bdf1 SHA-1: a8d105e47bc8b11a4bd2aedf6608d70dc8258314 SHA-256: 8d092ba281ddc3306c98a2fede1bf4590f713cfa4f7d14850c573f5f306f5981
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=piston+casting+process+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click on the malicious redirector link, which is likely a gateway to a phishing or malware distribution site.

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=piston+casting+process+pdf
    • http://files.bobminney.com/uploads/1/3/1/3/131379306/5436184.pdf
    • http://files.chillthepartyband.co.uk/uploads/1/3/0/8/130874567/2300692.pdf
    • http://files.topstonecanada.com/uploads/1/3/0/7/130775228/5037665.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/38181911176.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2375/files/23_effects_of_alcohol_on_the_body.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/61827562478.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/cebus_600.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/harkins_theatres_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/bikugibakur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zeperilifo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8458/files/garment_manufacturing_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6620/files/16338998157.pdf
    • https://cdn.shopify.com/s/files/1/0436/5172/7513/files/bihar_police_si_mains_question_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/59186710983.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3873/files/philips_respironics_dreamstation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/gabanezikomudixexozopi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0252/6887/files/best_reader_for_android_apk.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_off000080b1.bin
860ba7c089fdeb9b6340f94f587935136fc9048812deda68cd2623b5334f3048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B1 5292 bytes
font_01_sfnt_off000092b4.bin
e790e763578982c9ef8a9e7bbaaaafbed35333f406385afde742465c21f155ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B4 10480 bytes

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