Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be64256e48d7387…

MALICIOUS

PDF

48.4 KB Created: 2020-07-29 12:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31681d18d0549bdda0a7d57bc190de36 SHA-1: 879a039e070687102ea22de4acb7bdfae44d1503 SHA-256: 4be64256e48d7387fd62d1d59d1dfe2f66b7bc12acc032b6b182c24be81d24aa
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=dieta+sana+para+embarazadas+pdf, which likely serves as a gateway to further malicious content. The document body itself appears to be corrupted or heavily obfuscated, preventing a clear understanding of its intended lure.

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=dieta+sana+para+embarazadas+pdf
    • http://files.fishingtourismkefalonia.com/uploads/1/3/2/8/132814589/3222201.pdf
    • http://files.psi-loveu.com/uploads/1/3/1/4/131453249/xadewagijugevor-xovutob.pdf
    • http://files.nawink.com/uploads/1/3/1/3/131398222/1693692.pdf
    • http://files.fertileground.info/uploads/1/3/1/4/131454850/1461157.pdf
    • http://files.riddledwithdreams.com/uploads/1/3/0/9/130969772/9611429.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/fabezijopomidosinunura.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/86829892417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevola.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/muxonubuxojisedifewu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/78973469654.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/jimolomavob.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/9351450618.pdf
    • https://cdn.shopify.com/s/files/1/0437/9072/9377/files/60916254893.pdf
    • https://cdn.shopify.com/s/files/1/0438/6488/3355/files/pogozanopofevak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/keranejunezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/61423307856.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_off00007dad.bin
eef44ec385937edbe70b80c75c02c749ab4c030cced6fb7914472d1a265bb4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAD 5024 bytes
font_01_sfnt_off00008e9e.bin
5e51178e94df549ba0ebfa8c3c58a86fdf80a36769f3dc40bd81913170745818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9E 11108 bytes

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