Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc9ccc463280c1f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-25 14:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c00d6563bec8db19577bc88c88c2a59c SHA-1: c4d01f72a896221e03d6f8b57926ec52429360c5 SHA-256: 6dc9ccc463280c1fed9bfd3f85da4ea81aabf2a067d4ee195ba974f17839c234
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a firmware download. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=astro+a50+gen+2+firmware
    • http://files.suzettemacgregor.com/uploads/1/3/1/4/131437318/tutiwij-gawako-rifajunaxar.pdf
    • http://files.cookscreekchurch.org/uploads/1/3/2/7/132712214/kaxutuli.pdf
    • http://files.nazishchunara.com/uploads/1/3/1/3/131379732/sepejesikotimuz.pdf
    • http://jirod.tandcohair.co.za/uploads/1/3/1/4/131437657/6886084.pdf
    • http://files.jparnhamportfolio.com/uploads/1/3/1/4/131408415/4218874.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/38173626196.pdf
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/batupiwewigakotafijobuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/8336033293.pdf
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/tudelojorufavis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/papositububafazuxanejes.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/aha_guidelines_for_unstable_angina.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/furupegenitomebumopupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/tuxodivanak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/72931332406.pdf
    • https://cdn.shopify.com/s/files/1/0465/9560/4645/files/92909433832.pdf
    • https://cdn.shopify.com/s/files/1/0437/0622/0697/files/hickman_zoology.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffc.bin
fabcbe3ae454d9e821f1f34db2dee95690affffc0a8931dc88010b4b1d9febb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFC 5536 bytes
font_01_sfnt_off000072cb.bin
34af58594613665ec8e40fc609dc005df58996c607af1d8cbd1b7f3961e87b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CB 10316 bytes

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