Malicious PDF — malware analysis report

Static analysis result for SHA-256 b470d7c957c47583…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 00:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25761869782919abfe7a23dd0ea8f9a9 SHA-1: 5f51629cf64d397f33e8fbe1f18d94ef2c1ebf12 SHA-256: b470d7c957c475831e4f0fee00ee1f00ecc3aec0f7bc0ff317d3b521d6b5db20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=best+guided+meditation+apps+2019'. The document body text, though partially garbled, includes the same lure text, reinforcing the malicious intent of redirecting users to potentially harmful sites.

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=best+guided+meditation+apps+2019
    • http://files.lcooperillustration.com/uploads/1/3/0/8/130874238/a2294.pdf
    • http://files.jjjkinc.com/uploads/1/3/1/1/131164452/nufopikitujek.pdf
    • http://zuwiw.blackwellschoolfoundation.com/uploads/1/3/1/3/131379179/2843774.pdf
    • http://files.galerietannousart.com/uploads/1/3/2/6/132682802/dufek.pdf
    • http://files.aj-flower.com/uploads/1/3/0/8/130814706/5e77625ca6e.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/business_management_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/3982/4799/files/encyclopedic_dictionary_of_applied_geophysics.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/bajuxuduzujexero.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4780/files/5e_periapt_of_health.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/chocolate_factory_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9514/6139/files/celiakia_u_dzieci.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0813/files/xozojuniwabugadipapixux.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/lumovulefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/faxaletukakasopoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7831/files/50844589468.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/14466234166.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_off00006db8.bin
a0e62a10ddfc707ae08df3c5b7b2de31b50bf88e7c6b39cf85f8f6bfcc8b45d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 5684 bytes
font_01_sfnt_off000080fa.bin
a439bdf8408595337f29cdf4b1987a1de92881988d704951a49158ca35a32cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FA 10648 bytes

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