Malicious PDF — malware analysis report

Static analysis result for SHA-256 5821cbfb06275b42…

MALICIOUS

PDF

36.4 KB Created: 2020-08-03 05:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22bbb1a1088e4c8b3e62912fe809c7c8 SHA-1: 376f1715eae1217b586067319fbaa22f44840153 SHA-256: 5821cbfb06275b42874fc25052f4c11f80728b527dde44ce457303611aa78eb6
154 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, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=aspect+ewfm+user+manual', likely serves as a lure to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to benign Shopify domains, but the primary malicious intent is driven by the redirector. No scripts were extracted from this sample.

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=aspect+ewfm+user+manual
    • http://files.hinghamspeechtherapy.com/uploads/1/3/2/7/132740485/4272081.pdf
    • http://files.samerhatam.com/uploads/1/3/0/7/130739069/winetoke_kepuxavilere_movemuwavunegik.pdf
    • http://files.treasuredmomentsphotography.net/uploads/1/3/0/8/130874055/zavurusuja.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/34._432_118._426.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/filararerovexenujavilalo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/reguzepenili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/lebuxibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/how_to_update_fork.pdf
    • https://cdn.shopify.com/s/files/1/0433/4908/2261/files/39408107121.pdf
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/xiwudolenunonomuxedoj.pdf
    • https://cdn.shopify.com/s/files/1/0449/3040/0411/files/sunjoy_hardtop_gazebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0512/files/fibupofaxofitasomokopi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6705/files/rawid.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_off0000515e.bin
4d89ba3d1c2aef5425499549c724e2399d08545385a5918d27661ce89552419c
pdf-font-stream PDF embedded font (sfnt) at offset 0x515E 5240 bytes
font_01_sfnt_off0000632f.bin
b72adde08941872e68fe02d96dcdc1263b82c6a1be3a0bc61a1bd328fcaeee38
pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 9824 bytes