Malicious PDF — malware analysis report

Static analysis result for SHA-256 0871c1c8c0e390ef…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 21:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e569fad64a9f0cf8277595cf3fca65a SHA-1: b10cb6bb3a75cefdef6b2b534ee2416feceba13c SHA-256: 0871c1c8c0e390efaa06f30e47f4217d88d9105a9ddb6eba908c8edfb417d80b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain the same URL, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.cc/pify?keyword=osmosis+electrocardiography+essentials+pdf
    • http://files.mentalhealtheducators.org/uploads/1/3/1/4/131406303/wagitazese.pdf
    • http://degokavi.madhavagarwal.net/uploads/1/3/1/4/131437454/mejojilije.pdf
    • http://files.lvndrandgreen.com/uploads/1/3/2/6/132681771/e90e68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/4084626113.pdf
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/heart_pieces_twilight_princess.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zorosibal.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/kuvasiziwununijimuluru.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8340/files/sediwazesuzev.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/piwotimapamigeponasugov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/xibumogojogepoze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6728/files/3312265308.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/kimegugunoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/solidworks_flow_simulation_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/5610/2565/files/72400490089.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4550/files/case_files_obgyn_5th_edition_free.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000651a.bin
80a2d50adfa7e45698399a2837c1ad9ce80b9a83c842264280fda90ce15ba7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 5488 bytes
font_01_sfnt_off00007799.bin
2ce0042d01b0915dbd0c78bf600474ec933ca7292b7e6fcaf9ea87a158ba4409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7799 10580 bytes
font_02_sfnt_off00009b7c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7C 4324 bytes

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