Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51e654274791e8c…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 17:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f826a2b2e6c51452d4a933f1eb667b73 SHA-1: b566ac3c344a811fd6232c745f13107de237f149 SHA-256: c51e654274791e8c725b566812ed2349b3476639dd2c60f0c89cf2e867e93f42
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, contains text related to a 'biophysical society meeting 2020 program pdf' and includes the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many pointing to Shopify domains, indicates a link farm strategy. 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=biophysical+society+meeting+2020+program+pdf
    • http://files.theprincipalstory.com/uploads/1/3/2/6/132695883/1f60f8d1c0f4695.pdf
    • http://files.honchells.com/uploads/1/3/2/6/132681829/1c30cc9084f03.pdf
    • http://files.pooleknobsretrievers.com/uploads/1/3/0/8/130873804/8272239.pdf
    • http://xozosoxu.sister-love.com/uploads/1/3/0/7/130738524/nafezaxuti-ziseteva-lenujekanim-posodiruruvoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/jeropimenamovaxatapudugov.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/who_has_the_highest_midichlorian_count.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/quran_encyclopedia_by_dr_qadri_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/calma_emocional_bernardo_stamateas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/83636192697.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/fopuxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/exercices_sur_les_verbes_etre_et_avoir_au_prsent.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/teduxumebupovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/86856651977.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0440/6001/6790/files/sas_survival_handbook_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/4751/6325/files/23902124045.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_off0000686c.bin
d161a9dc10df1316adaeab71c1e9626318677c8e0e8d9226733519e91630fdb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686C 5996 bytes
font_01_sfnt_off00007cb2.bin
49c66d7fee0f96cfbefec63f659563f1ba6737e65f06e179061c793b484f695f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB2 10440 bytes

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