Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ad83843f810016…

MALICIOUS

PDF

38.6 KB Created: 2020-08-22 16:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c50bec2cd08666ef2ec03f858976bf SHA-1: aade1a8b8b5710d0d1fbf87c890503e1b6ea4aef SHA-256: 27ad83843f810016cfdcf8bea7dd75da73b59b35bf542f3968f1cc07a9df8426
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.ru/pify?keyword=avis+get+your+guide+cracovie', is flagged as a malicious redirector. The document body, though heavily corrupted, contains text fragments related to 'Avis get your guide cracovie', suggesting a lure to trick users into clicking the malicious links. The ML classifier also strongly indicated maliciousness.

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=avis+get+your+guide+cracovie
    • http://files.bellevuecavycritters.com/uploads/1/3/1/1/131164081/1364d.pdf
    • http://kaguwis.store.easy-editor.com/uploads/1/3/1/6/131606666/ganuzu_sajiguxomuxif_pumulujofi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/calendar_2020_printable_with_holidays_uk_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/nurodevetonupejuva.pdf
    • https://cdn.shopify.com/s/files/1/0462/2647/3111/files/47941003738.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/wuwomawedemifadujinawur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/35929311159.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/pudig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/bovupikikiwojexowusosoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/26819395062.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1558/files/rokofamosafimavida.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_off00005907.bin
f6a63f8d2ed9f511910f7f91d0582eee0947406736fd592f0f61c7375a5baa16
pdf-font-stream PDF embedded font (sfnt) at offset 0x5907 5228 bytes
font_01_sfnt_off00006ae4.bin
d0cbfa5af831f9138df8142a0ec0ff9d964bfe33a0b11681562a3e9da6efce0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE4 10324 bytes