Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42b65fe06b9b391…

MALICIOUS

PDF

42.6 KB Created: 2020-08-03 09:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e323439f8b3138e027d0b7e59e8a6e20 SHA-1: e787207c4bb5f00891890de73f6c918d531b0331 SHA-256: a42b65fe06b9b3918975a024bd7452a296a0e944baee0554bb92f9320fe7ceab
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=portable+pdf+editor'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to distribute malicious content. 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=portable+pdf+editor
    • http://files.marytischler.com/uploads/1/3/2/6/132681294/4278814.pdf
    • http://files.lundeensliquor.com/uploads/1/3/1/6/131606135/mugijo_kavepexo_xejuzax.pdf
    • http://files.toprodbassmasters.com/uploads/1/3/1/4/131438641/wefevuv-disuronu-rozovajuvamop-vitigodelanulo.pdf
    • http://files.innervoyages.com.au/uploads/1/3/1/4/131452883/gifafonup-dolirovifubofed-buronepidosiza.pdf
    • http://files.freerangeworship.com/uploads/1/3/1/4/131453867/jerovegavibojumoso.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/9612799553.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/fafetokojipekimoniku.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/gifaravepabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70474217151.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/rogegajolawov.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5510/files/83418198336.pdf
    • https://cdn.shopify.com/s/files/1/0437/8407/7473/files/cookie_clicker_auto_click_golden_cookie.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/35387116249.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/24797934614.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/31176363622.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/tigunatirobom.pdf
    • https://cdn.shopify.com/s/files/1/0436/8538/0246/files/ccleaner_key_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/joragoguve.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3570/files/intermediate_algebra_lehmann_5th_edition.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_off0000682d.bin
c87065075e2196f8f52cded86b39f7e8447eb0b2f9c0bc829d0da4036515b5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682D 4996 bytes
font_01_sfnt_off0000792f.bin
316de085e52ec90c746af220b7039872903070b63b0fb94bf1d003c2ad5c1d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 10592 bytes

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