Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b35e46efa75ff95…

MALICIOUS

PDF

45.1 KB Created: 2020-08-10 09:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0afc4b13a414a05f1c3e71fc31944e7c SHA-1: 3be5b8515d42924f7a3e0edc6d1afdb77ff5361b SHA-256: 7b35e46efa75ff95641f04f1c475d4c8bf7231735e648685e6fb2bef4363e3fb
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a PDF redirector link pointing to 'https://ttraff.ru/pify?keyword=pdf+file+merger+app'. This indicates a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=pdf+file+merger+app
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.queerapocalypsesolutions.com/uploads/1/3/1/6/131637055/nebafikobeva_zumidegu_guvixasefotub_sotog.pdf
    • http://bekasojil.heartworkbirthservices.com/uploads/1/3/0/8/130814124/3746314.pdf
    • http://files.kengoesclick.com/uploads/1/3/1/4/131437513/4c988cc4.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2902/files/allah_names_wazaif.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/rukud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/milusabufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/astm_b117_standard.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/77305510361.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/four_discourses_against_the_arians.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/wefozaxixemezepujemajuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/kefazijasalutavidov.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/sepodevasomone.pdf
    • https://cdn.shopify.com/s/files/1/0432/9429/4171/files/fosamubuvajisotuvugawogo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/thieme_atlas_of_anatomy_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/autocad_2020_text_box.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/
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/ruku

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074cb.bin
e97d0f7513c655cc42f99718aecfb1582019f99292aa631b0851e81957e7ea94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CB 5184 bytes
font_01_sfnt_off00008658.bin
1017c6192272a4d545b44f12feae4db3b7b22ea3f90afd347c10947353122b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8658 9704 bytes

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