Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb1dc83ab917a42…

MALICIOUS

PDF

47.5 KB Created: 2020-08-05 01:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a58c6d85a7e664f71cebbe1eb76556f SHA-1: d56cfc12c4faab2c87d8fc8d8020b0dcaeea0ece SHA-256: 4bb1dc83ab917a4214b594ee924978acbfb73e79df9d5ad8e1d4a364f38f5b66
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many of which point to a redirector service that is known to host malicious content. The document body also contains a link that appears to be a lure for a free online translation service, which redirects to the malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute malicious 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.ru/pify?keyword=free+online+pdf+language+translation
    • http://files.iammonicaparker.com/uploads/1/3/0/7/130738681/6ac4fc567ecb8.pdf
    • http://files.parentfirstcouncil.com/uploads/1/3/1/4/131452958/wabuwob.pdf
    • http://files.bsuspringtraining.com/uploads/1/3/1/8/131856380/0d84065010446.pdf
    • http://files.theseasonalapothecary.com/uploads/1/3/0/7/130776601/69373.pdf
    • http://tobafu.palmdigital.org/uploads/1/3/1/4/131453284/mewibome.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/tisumewefixamujemereze.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/battlestar_galactica_watching_order.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/55773575909.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/45937725031.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/zewibanawisevam.pdf
    • https://cdn.shopify.com/s/files/1/0429/3754/8959/files/xolonutapisogigizalawunug.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/71518962529.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/26730281066.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/16107048273.pdf
    • https://cdn.shopify.com/s/files/1/0430/6767/0689/files/gusijuli.pdf
    • https://cdn.shopify.com/s/files/1/0441/1126/5944/files/91553897641.pdf
    • https://cdn.shopify.com/s/files/1/0435/3828/4696/files/pogeb.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_off000071c5.bin
702b147cf0dc81492300ab57b7adf703bd5f2c94dfb8ec996aaf2ab0a1cea581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 5164 bytes
font_01_sfnt_off0000836e.bin
39a95b710a7ee22926ea14d033f426f2baa6ef61db555aff695c59ba1fbca09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836E 13848 bytes

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