Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4f16f1f27f9a17…

MALICIOUS

PDF

49.1 KB Created: 2020-08-11 06:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be7e5933d85e338962c572eba30e44b SHA-1: 0bc2fe10cd71e6f110d1acb58a816527dc66b994 SHA-256: ba4f16f1f27f9a17daa1799e4e94eed6757ae5adb752cdece2cc2b42950428f7
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Types of contrastive analysis pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=types+of+contrastive+analysis+pdf
    • http://files.thepygmygoatclubofireland.com/uploads/1/3/1/4/131438036/zoled_famajive_zupoxojojani.pdf
    • http://kigupip.mrsmalloysclass.com/uploads/1/3/1/4/131406390/fewevati.pdf
    • http://files.updatescentral.com/uploads/1/3/1/3/131384018/fotimiva_nidanu_gibuvidedavade.pdf
    • http://files.harrisburgelementary.org/uploads/1/3/0/8/130813965/linuf-nonigasebe-jivuduwoni-moganorax.pdf
    • http://files.neonopen.com/uploads/1/3/2/6/132682022/1237491.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/85246283029.pdf
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/recommendation_letter_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/minecraft_java_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/27896798552.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/bacchae_paul_woodruff.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/38089105508.pdf
    • https://cdn.shopify.com/s/files/1/0448/0165/4935/files/idm_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/wapefiriberoxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/kimuzigilavomak.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4847/files/aadhar_card_form_download_assam.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_off000082f7.bin
9a0566d27334e0ea5234d88eedfa545e5fe0590bc902e99a244f1abd46231a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F7 5260 bytes
font_01_sfnt_off000094f3.bin
d6ae39c0f94856ef7fab7c84544d8299c01e12282787a946feb638cc79ea5100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F3 10040 bytes

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