Malicious PDF — malware analysis report

Static analysis result for SHA-256 5538eae34ef55490…

MALICIOUS

PDF

63.4 KB Created: 2020-08-09 06:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5945157aed97e1ddc34e045681cda28 SHA-1: b45e3e7f7bdbb8e67138c9d700b9876d0172a374 SHA-256: 5538eae34ef554907bd474811f395c0d800e6fa86f59fd8a98e53a23ef2dcad7
152 Risk Score

Malware Insights

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

The PDF was flagged for containing links to known malicious redirector infrastructure and a large number of external links, suggesting a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=les+60+aliments+les+plus+riches+en+potassium+pdf. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The ML classifier also strongly indicated maliciousness.

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=les+60+aliments+les+plus+riches+en+potassium+pdf
    • http://files.lenserotica.com/uploads/1/3/1/3/131381539/6144208.pdf
    • http://files.compileacademyfootballclub.org/uploads/1/3/2/7/132740978/gonaguvidogir.pdf
    • http://files.ringatedesigns.com/uploads/1/3/1/6/131606118/3370821.pdf
    • http://files.gracebiblechurchbaytown.org/uploads/1/3/1/3/131381374/5523834.pdf
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/72795231180.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/67699028722.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/skyrim_save_cleaner_sse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93236297381.pdf
    • https://cdn.shopify.com/s/files/1/0431/7613/2774/files/vegetarian_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/21456137063.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/western_civilization_spielvogel_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0446/5029/9555/files/barron_s_regents_living_environment.pdf
    • https://cdn.shopify.com/s/files/1/0433/8004/8023/files/pexesogepaxuvurobaram.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/vomemikevolokuvi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/86387431908.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/analytical_mechanics_fowles_solutions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e44.bin
6a781ae35afa8a86303233a3bf96b5c1ab9f654980f34f78e3b4e5b48db17e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E44 5512 bytes
font_01_sfnt_off0000b0c6.bin
dc0d49d7b0978ba2667f96b593b57266d8df996cb535247471cffa8f98e4fa40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C6 16720 bytes
font_02_sfnt_off0000e1b4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 4324 bytes

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