Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bf148bf3cbab8c…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 06:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5ec216208000af5d49c162621aa5a3 SHA-1: 8769c4353ef3a3d4f94e41014620df17760555f0 SHA-256: 27bf148bf3cbab8cafbe6a74b0d472a8681d21753436b0497b4724c79fd1a732
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a significant number of embedded links, many pointing to potentially malicious redirectors. The primary malicious URL identified is https://ttraff.cc/pify?keyword=heliocarpus+appendiculatus+pdf. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or redirection attack designed to lead users to harmful content.

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=heliocarpus+appendiculatus+pdf
    • http://suteli.knowlebadminton.com/uploads/1/3/0/8/130814017/lojezesurolinalukil.pdf
    • http://files.musedigitalmarketing.com/uploads/1/3/1/8/131856646/7942852.pdf
    • http://files.littlebitsofhawaii.com/uploads/1/3/1/8/131859261/3057778.pdf
    • http://files.wildonionfarms.com/uploads/1/3/1/3/131398133/basizof.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/gelilimukisewutoxafunig.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/96636464096.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/nubibolupazurufekaril.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/nulojogiwideje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/87764763303.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7495/files/chemistry_laboratory_manual_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/alport_disease.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/xevazazumol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/fowumejapukimavugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/moridodijajesojefi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1285/files/89294950353.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_off00006289.bin
46578af180c0aef399a1e5a95a80d9b4bfb3305e09ed472b8705034ecc9e9d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 5112 bytes
font_01_sfnt_off000073fa.bin
9aa775f36786d70e850dce85c5c81ebe0c9680cd4e3aaf3d3f6baa1f33895ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 10364 bytes

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