Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03a9164443e259…

MALICIOUS

PDF

32.4 KB Created: 2020-08-14 03:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e95bf96438ef7774a4e8af81187bf23b SHA-1: 4b282ed6d071c4d15b2349fb3d1e6a0404a2cbf2 SHA-256: 4d03a9164443e25919aae3189ceb0c6015d0b68cf745425972c66f1465db86e2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though malformed, includes text related to 'Copeland compressor manual pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious distribution pattern.

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/wb?keyword=copeland%20compressor%20manual%20pdf
    • http://files.mandelcounseling.com/uploads/1/3/0/8/130873736/wegalaf-mabedijupob-fezawiwi.pdf
    • http://jafirov.querenciayoga.org/uploads/1/3/2/6/132682883/gisivolilugi.pdf
    • http://files.thenaturalflame.com/uploads/1/3/0/8/130813134/dumitikega_kujefipof_rusutukak_zogolilerinud.pdf
    • http://vifuvos.paschoolpress.org/uploads/1/3/0/8/130874493/gariwuleladikod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/github_markdown_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/31077343133.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/xesajifolowuwodiramabixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/gibak.pdf
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/the_dark_id.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3755/files/adventures_of_huckleberry_finn_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/vasipoxapame.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/ririxiribijobubuvavebuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/que_es_la_atmosfera_terrestre.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/il_barbiere_di_siviglia_libretto.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/jenajoforasad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/reliability_and_validity_of_questionnaires_in_research.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_off000045de.bin
daeeda23be5cf6ca28e4fb5ceb72a556c43f1dcf95325c62be09201f1d1240bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45DE 5208 bytes
font_01_sfnt_off00005777.bin
cddd0c268aa18c9a8cd92dce56f039d4cd8e4fd389051488d35265573b50b694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5777 8532 bytes

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