Malicious PDF — malware analysis report

Static analysis result for SHA-256 db906724be1d33bc…

MALICIOUS

PDF

47.6 KB Created: 2020-08-11 00:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d38d8cecc4811322b02b2f412625903e SHA-1: 59fa926305e5d2e61491bcdf736edbbccce0cb56 SHA-256: db906724be1d33bc61bfbc41408058ee71dca51a97faef4cfa8a5979a375bd66
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 cdn.shopify.com, and one critical link directs to a known malicious redirector at ttraff.ru. This indicates a phishing or malicious redirection attempt. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of the exact payload.

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=cours+anatomie+appareil+urinaire+pdf
    • http://zaduzuzem.ceciliabramhallart.com/uploads/1/3/2/7/132710714/a671a.pdf
    • http://files.erictigley.com/uploads/1/3/1/4/131437402/0dd9c0d.pdf
    • http://mesujibu.celinacares.com/uploads/1/3/1/3/131381679/nuwaxawiravetodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/boyce_codd_normal_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/dikufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/cutaneous_larva_migrans_journal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/mixotizofetikebumajonelig.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/31768226704.pdf
    • https://cdn.shopify.com/s/files/1/0431/0781/1482/files/kiwotaziw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/28776519140.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/wowabudu.pdf
    • https://cdn.shopify.com/s/files/1/0450/0642/2184/files/video_killed_the_radio_star_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/karuzaxanapimebavuwidupus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/14485387755.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6657/files/ho_chi_minh_city_guide.pdf
    • https://cdn.shopify.com/s/files/1/0455/3559/2613/files/43722060813.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_off00007865.bin
6b566b657c906b785961092a0120df13dc734afdd07204c0271b024ba16dcfba
pdf-font-stream PDF embedded font (sfnt) at offset 0x7865 5092 bytes
font_01_sfnt_off0000899e.bin
bb3d3fd1477905c5c33a33ca8a9100990d6f2ee373605f43f74fee5a7885b468
pdf-font-stream PDF embedded font (sfnt) at offset 0x899E 12136 bytes