Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d7ea48039cdce6…

MALICIOUS

PDF

47.2 KB Created: 2020-07-21 15:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312579cb1ddf4eb9c23bdea11c7e2f86 SHA-1: c528e5a9950d56d64e02d59854aeed9d60b5c45f SHA-256: a5d7ea48039cdce66d9ec39d85bdea468db2f5cc3c4a9e4ccecdca999a1ac2a7
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to reference 'Az- 300 exam questions pdf', suggesting a lure to trick users into clicking the malicious link. The PDF also hosts a large number of external links, many hosted on cdn.shopify.com, likely for SEO manipulation to increase visibility.

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/pify?keyword=az-+300+exam+questions+pdf
    • http://files.allysonkellum.com/uploads/1/3/1/3/131379443/xutujugifades.pdf
    • http://files.foodfixations.com/uploads/1/3/0/9/130969435/xovemewivox_togaviviburo_bulemeforili.pdf
    • http://files.rcubedlifestyle.com/uploads/1/3/1/3/131380720/rewid-wupuxudaluzunib.pdf
    • http://files.oegallery.nz/uploads/1/3/0/7/130739043/gizizuniwoko_sivebitega_sojugij_sejenogujurif.pdf
    • http://files.contoursandclay.com/uploads/1/3/1/3/131379039/8687607.pdf
    • http://files.rcubedlifesty
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/78271361274.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/36397929780.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.pdf
    • https://xokiwija.files.wordpress.com/2020/06/valomisabugepabujekege.pdf
    • https://nogilofonula.files.wordpress.com/2020/06/87346422665.pdf
    • https://zabukutevil.files.wordpress.com/2020/07/14765821001.pdf
    • https://fadipitevak.files.wordpress.com/2020/07/96612747257.pdf
    • https://vokizowonaso.files.wordpress.com/2020/06/18878576633.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/toviketepefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/kaden.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1180/9190/files/64493677347.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/woropobupu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/40459293561.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/popejugifejesituwojugig.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_off00007977.bin
9700f1ce19c6a4cd0b2dc107ba4db548e2dc99ae9a58ca81d448b9b5ef42b2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7977 5512 bytes
font_01_sfnt_off00008c32.bin
41029d92e51cd0c3e122a15422c90de541c9e3da3b6f570f5dd4601049a67632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C32 10328 bytes

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