Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c838305fca2036…

MALICIOUS

PDF

114.8 KB Created: 2020-08-11 00:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e541caa6da39ea4b22c07cf9f6ae45b SHA-1: 1e382a8a91f06b68df150499ef2c8327e61be487 SHA-256: 48c838305fca20368b2c57334c0c1e9e49004a90e2959e94bd83221bb0d13cea
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body contains text related to 'Reproduction in amphibians pdf' and includes the URL 'https://ttraff.ru/pify?keyword=reproduction+in+amphibians+pdf', suggesting a lure to trick users into downloading malicious content. The presence of numerous links to external PDFs indicates a link farm strategy, likely for SEO poisoning or distributing further malicious payloads.

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=reproduction+in+amphibians+pdf
    • http://files.habiology.org/uploads/1/3/0/8/130874102/ginoweku.pdf
    • http://files.backroadsfab.com/uploads/1/3/0/7/130738949/xeletumapejiw.pdf
    • http://files.greenergysys-pr.com/uploads/1/3/0/7/130776401/vejisivesogog.pdf
    • http://sutirovi.balancedforlifeyogatherapy.com/uploads/1/3/1/1/131164239/sapifudibex.pdf
    • http://files.elawrencecpt.com/uploads/1/3/0/7/130775992/wamorezizonom_gewunaki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/36692736823.pdf
    • https://cdn.shopify.com/s/files/1/0449/9157/8276/files/calculus_college.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/328438937.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/34481351523.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/fedevan.pdf
    • https://cdn.shopify.com/s/files/1/0451/6282/3834/files/islamic_banking_and_finance_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/57553256061.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/tijunodijesatikavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/49059122994.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/form_5329_t.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1207/files/lexique_d_assurance.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_off00017d2f.bin
7f4ed840ed158fa29a58dd0de83bb0f0a7e0e707b7a183916125143ec357f08f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2F 5512 bytes
font_01_sfnt_off00018fb7.bin
a0670122d8e650dfd423b2f64cd28efac1aa98732fae67bfb12abfde116389dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB7 14888 bytes

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