Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab886a650ae222ea…

MALICIOUS

PDF

43.3 KB Created: 2020-08-15 06:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 383ebfbfb640685012d3c041fb6c63f6 SHA-1: 349d98c51de05d29cb32025aefb9a07bfbd2ef47 SHA-256: ab886a650ae222eadaebabfacdcfae934ba5cfa865a85039ca9e980e5cc9bd53
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests the document is designed as a link farm to obscure the ultimate malicious destination. The primary malicious URL is https://ttraff.ru/wb?keyword=thermal%20conductivity%20of%20water%20pdf, which likely leads to further malicious content or phishing attempts.

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=thermal%20conductivity%20of%20water%20pdf
    • http://files.norwichmedievalmysteryplays.com/uploads/1/3/1/8/131856195/tukukitutenefe.pdf
    • http://files.sumikoshimada.com/uploads/1/3/2/6/132695575/b4243333be412.pdf
    • https://cdn.shopify.com/s/files/1/0429/5262/2236/files/1848558638.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/lawabatogasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/dalumogidibaradomiruwi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8283/files/29242200550.pdf
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/aadhar_card_form_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/wexuvubeke.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0486/files/bordeaux_bus_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/0193/8079/files/airtel_mobile_money_rates_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0450/9266/7544/files/evolucion_del_cerebro_humano.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7573/files/3347062419.pdf
    • https://cdn.shopify.com/s/files/1/0437/3928/3608/files/80059539367.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_off000069de.bin
7859cb3e641bc1ac301516bc0b63c96e5bba9f580b50ef2a6c10e56673a7964d
pdf-font-stream PDF embedded font (sfnt) at offset 0x69DE 5420 bytes
font_01_sfnt_off00007c3d.bin
53dd5f305dc896738375c21b31d51c42cb3d3fd941134619396f96dc75bdca67
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3D 11212 bytes