Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac87caa5ca997dc6…

MALICIOUS

PDF

44.0 KB Created: 2020-08-09 04:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f891e2a94a08ab9fa68f20cb4247fa35 SHA-1: 21e5c2436d39d65663c115f296b965eb04eb80ca SHA-256: ac87caa5ca997dc66c78ca2f31872f694cc4b263c2a9097202badb7341d81c46
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. One of these URLs, 'https://ttraff.ru/pify?keyword=engineering+economics+annuity+example+problems+with+solutions+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and embedded URLs, suggesting it's not intended for human consumption but rather for SEO manipulation or as a lure.

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=engineering+economics+annuity+example+problems+with+solutions+pdf
    • http://koxav.advancedmaterialsservices.com/uploads/1/3/1/6/131636725/6242304.pdf
    • http://renejeg.fitkidtext.com/uploads/1/3/2/6/132681352/8929525.pdf
    • http://votasodop.cotelab.org/uploads/1/3/1/6/131636948/pixoxaw_notega_mowutivudukata_javotufelujipuw.pdf
    • http://files.jojoamo.com/uploads/1/3/1/0/131069819/dd4e7c4.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/convert_to_word_arabic_font.pdf
    • https://cdn.shopify.com/s/files/1/0448/0725/8269/files/farmall_h_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/transformador_de_alta_frecuencia.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/administrao_da_produo_chiavenato.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/rafoxupolixovoluxavub.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/tokunarofazevoneguzelumuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/mojekemibenan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0458/4355/files/safotifazixivut.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/memukixibaranofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/bugijuzunadabumugepawom.pdf
    • https://cdn.shopify.com/s/files/1/0451/0508/6616/files/the_bible_timeline_chart.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_off00006a0f.bin
55844c705009e7e4b11c60eceb09a5625a2323fdbe7f007154f55222ad3ec0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 5928 bytes
font_01_sfnt_off00007e34.bin
8b202a768b82b8e9497462a7493f6d151188ff89a50a079924969f8195b3a554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E34 10992 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.