Malicious PDF — malware analysis report

Static analysis result for SHA-256 a956f551b3b63181…

MALICIOUS

PDF

47.2 KB Created: 2020-08-16 20:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5ad733e14ba81405f584a81b5677282 SHA-1: a383963d3ddc768cc2c5a539d99b8c12d21b1533 SHA-256: a956f551b3b6318125c32dafe8d313078f4b397d954db4886b3ad5d0c77337ab
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=google+chrome+for+android+2.+3+free'. This URL is presented within the document body, disguised as a free download lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many hosted on cdn.shopify.com, suggesting an attempt to distribute malicious content or engage in SEO manipulation. 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.cc/pify?keyword=google+chrome+for+android+2.+3+free
    • http://files.brentwoodbayvet.com/uploads/1/3/1/4/131438353/8058f81f45cd82.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/nojolunupuzenabekumon.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/change_management_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/detail_magazine_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/3265/7575/files/toddler_bed_sheets_australia.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/bogiburox.pdf
    • https://cdn.shopify.com/s/files/1/0432/1551/9912/files/xamogimogakegonopijixemox.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5878/files/non_alcoholic_cocktail_recipes_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/76912658646.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4470/files/nilinuxinejiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1650/2939/files/7465294054.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/sujejaxuwawafuforu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/18500625082.pdf
    • https://login.salesforce.com
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061cb.bin
baffb02a3bdac35ab60b4c3a80203e96b65a5ba96ed0c3f3d77497837a11d6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CB 5324 bytes
font_01_sfnt_off000073b8.bin
fef9a56987d1b7b02490d12944ccfc0f16466134d4ba37ed793457202bcdee97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B8 14864 bytes
font_02_sfnt_off0000a1d9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D9 4324 bytes

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