Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64cb4c857cc6ffe…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 08:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4f5e5431219377ba18def46f581585a SHA-1: 17e163ba35b18cf6668bd1caac026912ef9e8ba0 SHA-256: a64cb4c857cc6ffef82acf12bb0b7e7716c260b206582db76680ea80fa403612
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract traffic. The primary malicious indicator is the redirection to `ttraff.com`, suggesting a phishing or malware distribution lure.

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/wix?keyword=quran+16+lines+app
    • https://cdn.shopify.com/s/files/1/0437/0530/3205/files/53225381832.pdf
    • https://cdn.shopify.com/s/files/1/0438/0344/3361/files/nesunaxawokudanufif.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/jaxeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/55810068581.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/bupujekuwetaveva.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/raxuradanag.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/texuveludodoruxewa.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/35745141613.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/piwanebevufoganori.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/89458150570.pdf
    • https://cdn.shopify.com/s/files/1/0465/4563/3438/files/40761368121.pdf
    • https://cdn.shopify.com/s/files/1/0437/1005/4554/files/chart_js_tooltip_template_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/aarti_sangrah_marathi_free_download.pdf
    • https://static.usrfiles.com/ugd/b28561_8cf67982fb7f44cc9607ba9f41bdb91b.pdf
    • https://static.usrfiles.com/ugd/b8c837_312504d1cf2d44fcb4f3b3d8e2ce6d74.pdf
    • https://static.usrfiles.com/ugd/98857b_d8f72756d0a240cfad3540def8400316.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005278.bin
860e0469e7d270b71385940558eec6a9ebfa95d0f3831bbd8a586011c787b883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5278 4772 bytes
font_01_sfnt_off000062aa.bin
f799323fe32d46c56548d5b29ad235440cf6bb793a05d260c1ca7938685f3434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AA 10008 bytes
font_02_sfnt_off000084f5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F5 4324 bytes

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