Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1070ba271799e9a…

MALICIOUS

PDF

44.8 KB Created: 2020-08-10 06:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315c79210f9b47f5ec27496ae0901d12 SHA-1: 555f0b379ca7c65d7934bf9c11ec5cc6cdcbd06b SHA-256: e1070ba271799e9a220ef49a1d97bd1444a9e817dba79fb1e51c5ef062f98e45
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with 19 embedded external PDF links, many hosted on cdn.shopify.com. The document body is heavily obfuscated and contains a URL that appears to be part of the link farm. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or phishing 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=social+media+strategy+sample+pdf
    • http://files.michaelderjabin.com/uploads/1/3/1/3/131379059/7918897.pdf
    • http://zenaxevu.it-starts-here.com/uploads/1/3/2/6/132683188/6889211.pdf
    • http://files.yoursongstory.com/uploads/1/3/1/4/131453870/6374906.pdf
    • http://files.jparkercyber.net/uploads/1/3/0/7/130775249/ginanidolorefi_zutazavow_xexatoxadizat_pujugejemalix.pdf
    • http://files.laraodwyerbrown.com/uploads/1/3/2/7/132741322/d82dab9b.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/zufazolozikepeta.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/xilakodekimom.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/16100494983.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/pdf_ausfllen_online_kostenlos.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/bloodborne_suspicious_beggar.pdf
    • https://cdn.shopify.com/s/files/1/0435/4126/6587/files/gurazajufone.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/pogowuxabiwawudo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/big_papi_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8309/files/togafixakakexudidivewa.pdf
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/genetics_by_pk_gupta_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/45937190568.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/bijerogigato.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/wozugotiduroj.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_off0000706e.bin
a06f773b974b865bacfbc3518b470e1cc15969effdbbba15118df1f277348501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706E 5680 bytes
font_01_sfnt_off000083b9.bin
db1916b6c43e50833f133a9b7545c3ba818b3444b8fb5a65f7556e4783ccb2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B9 10088 bytes

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