Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6017ccfb56b294…

MALICIOUS

PDF

75.2 KB Created: 2020-09-05 12:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4eed9351c574f5e113b029fdb362b628 SHA-1: 2c4d69a69a13bc7d781af248198ae6c4b4a3835e SHA-256: 9a6017ccfb56b294cd3267c31e610fb88b7d87fc2cadff38a50c2b83747543ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, directing to 'https://ttraff.link/wix?keyword=seismic+data+formats'. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The embedded links likely serve to obscure the true malicious destination or to appear as legitimate content.

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.link/wix?keyword=seismic+data+formats In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3950/5056/files/good_clinical_practice_guidelines_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/2166-_8-_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/98220328952.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6535/1073/files/50026743141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7083/3319/files/vancomycin_resistant_enterococci.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5988/5733/files/binisojili.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a31856_aa55239d0d4b49368454d55923d3e328.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bdeb4c_806f563195c949b09fd736ef2d03f117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/9567/1203/files/latest_bollywood_song_video_in_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/centrifugal_casting_machine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/sojomerunudaxazi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 4920 bytes
SHA-256: 2f05814f022e7291982990ae2768efbb73c16dbfaf3446727d3749f01a47efbd
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10068 bytes
SHA-256: 891e20e156e33780920481ee36e6ec93f5ec2f620f56c194365b9d1b120579d5
font_02_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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