Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd7348efe21a252…

MALICIOUS

PDF

59.5 KB Created: 2020-08-12 11:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca6f456fb5b7f11cbdeb8bf41c3908e7 SHA-1: cffd40732894810aa2dc01de65d0444f7028ad6f SHA-256: 3fd7348efe21a252f291ccd359b18da77a7b84cb0060d1357c7c11d3c85a52a1
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL. This suggests the primary intent is to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting.

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/wb?keyword=postharvest%20diseases%20of%20fruits%20pdf
    • http://files.hms.com.au/uploads/1/3/2/6/132695194/tabimezatidi.pdf
    • http://files.robynshaw.net/uploads/1/3/2/6/132695465/tokefadi-matatu.pdf
    • http://wotaz.fcccambridge.org/uploads/1/3/1/0/131069839/towegigawopukedosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7063/files/lp_basalioma.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/83788715691.pdf
    • https://cdn.shopify.com/s/files/1/0434/0852/3416/files/voligikowiwepug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0752/files/99111046241.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/69366372602.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/navy_seals_cadences.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/attack_on_titan_season_3_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/84466635281.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/86245743775.pdf
    • https://cdn.shopify.com/s/files/1/0449/1198/4795/files/43250774911.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/a_user_s_guide_to_network_analysis_in_r_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/1635764759.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/dimazanalewapuxija.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/lasosijojorajefuxigimapad.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_off0000aa8e.bin
0b2cb8c98c93a4c0fd7fe2461a027658575e50dee87a69458c5a1a4e34d7f7ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8E 5160 bytes
font_01_sfnt_off0000bc1e.bin
dfbb43ddafeffbbc96905978ec269d4ee136cf717fb3392d69917a98a5f2a619
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1E 10772 bytes