Malicious PDF — malware analysis report

Static analysis result for SHA-256 889f8d63731792fb…

MALICIOUS

PDF

44.1 KB Created: 2020-08-19 08:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e594498e3658973dddcdece8e9893d8 SHA-1: 31e856d4ce67beeee5c1fd540f563b49fa30c6f1 SHA-256: 889f8d63731792fb9f2f86e50a784d63d680e5180f3400848b18caf6caf7bcb4
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning model and heuristics indicating malicious redirector links and a link farm. The embedded URL points to a suspicious domain, ttraff.com, which is known for redirecting to malicious content. The document body contains garbled text but also includes the suspicious URL, suggesting it's part of the lure. The presence of numerous links, many pointing to Shopify domains, indicates an attempt to obscure the final malicious destination.

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.com/pify?keyword=karuppusamy+kuththagaithaarar+tamil+songs
    • http://files.advocates12508.com/uploads/1/3/2/8/132814611/powimixapelo.pdf
    • http://zexebi.theridingtherapycenter.org/uploads/1/3/1/6/131606731/bipijemerujoluxovad.pdf
    • http://lifipi.sertoma-gunshow.com/uploads/1/3/1/3/131379992/fepalezobazo_poronew_nipupowo_ridoma.pdf
    • http://bubijiwe.softcast-technology.com/uploads/1/3/2/3/132303064/menona-vewofevotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/state_biot_savart_law.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/kexidogumotifakosuxem.pdf
    • https://cdn.shopify.com/s/files/1/0451/9621/4423/files/vyapam_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/autism_spectrum_rating_scales_asrs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/godikuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/play_based_learning_activities.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/36185594121.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0739/files/pmbok_5th_edition_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.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_off0000668f.bin
e66aeed82b54f9a94376327342ff4a890658b319d95c858a9b4310939eae92d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5368 bytes
font_01_sfnt_off000078bb.bin
5a836651868472bc7ef606b50961a24ff4cacfbbe4a6e62bc129c65458e5135b
pdf-font-stream PDF embedded font (sfnt) at offset 0x78BB 13568 bytes