Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d33b1663e0c998…

MALICIOUS

PDF

49.0 KB Created: 2020-07-29 21:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fadf9bb08cb40b5ee714e547dda516c5 SHA-1: fce581dd3f0557c07052ff09d22fb559ff415d06 SHA-256: 75d33b1663e0c998887a40f3225a67eff4fe3628482649f78bfb7372050e5a29
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to redirect users to malicious websites. Specifically, it links to a known malicious redirector at 'ttraff.ru' and also includes a large number of SEO-optimized PDF links hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to job applications.

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.ru/pify?keyword=resume+application+letter+pdf
    • http://files.holyfamilytopeka.com/uploads/1/3/2/8/132814220/xiporinal.pdf
    • http://files.rockingcleatherandboutique.com/uploads/1/3/1/3/131383510/7375545.pdf
    • http://files.midrenelamy.com/uploads/1/3/1/4/131437593/gexiboro-weted-dabowuwejizowur-rudanobogapoxa.pdf
    • http://files.foreverhorsecrazy.com/uploads/1/3/0/7/130775195/lepikaluxe.pdf
    • http://files.midrenelamy.com/up
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/magurube.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/tonomemomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0641/1431/files/gekevusiluwibiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/tugotojeninoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/66624559354.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zimupumunilojoduwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/24631128741.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/33560853702.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/fuzonupokuwezisuxasis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3436/1503/files/18623947624.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/2333705494.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/sufeporazuguxupapukera.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/rigomebexuvoruputobala.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/66279162599.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/56042134126.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_off00008139.bin
866afe486af33a8ca889f0849644745c7a1a0c6862c84bacd3ab1002049b41a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 5192 bytes
font_01_sfnt_off000092c0.bin
29ee0060614cce1f564ac1d21ead05f780bd5cddac41c697493d874bbe50c400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C0 10908 bytes

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