Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf623c1229fe0e1…

MALICIOUS

PDF

69.4 KB Created: 2020-08-14 04:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef22172b66cbbbdaebca8b1c72c6f5f3 SHA-1: d527b6e28515bf7b11c986d5cb99d9b0ffc7fb89 SHA-256: ebf623c1229fe0e1150cd4d4e48b617cf767ace445baabb35ab4d9f2c71df434
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, including a known malicious redirector. The document body itself is heavily obfuscated but contains a URL that is also present in the heuristics. The primary attack pattern appears to be a link farm, potentially for SEO manipulation or to distribute further 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=afaan+oromoo+books+pdf
    • http://files.liffordhealthcentre.com/uploads/1/3/2/7/132740905/lezotoko.pdf
    • http://files.fleurdelizcandles.com/uploads/1/3/2/6/132681452/1e5171813.pdf
    • http://files.bainbridgeje.com/uploads/1/3/0/7/130738569/tisisofavilufudu.pdf
    • http://files.avivapressman.com/uploads/1/3/1/4/131453735/zegijedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/iphoto_yosemite_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/gixagakaveneguzunazipakuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/etat_de_rapprochement_bancaire_exercice_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0439/8671/4782/files/proscan_tv_manuel.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/51188425601.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/how_to_convert_to_vertex_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/3411/5233/files/salotaximinarib.pdf
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/wodesafisozaxubosed.pdf
    • https://cdn.shopify.com/s/files/1/0429/2830/8387/files/irctc_railway_station_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/vukinesawovimukeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/1263/7351/files/o_conde_de_monte_cristo_alexandre_dumas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/atherosclerosis_biochemistry.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/60206860157.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/ultimate_marvel_vs_capcom_3_character_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/the_time_capsule_book.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_off0000d1ca.bin
80757300b9719d56a9f174ded1f8b8c1d3a49c6b8b64a4ba3a764bd962645fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 5348 bytes
font_01_sfnt_off0000e3de.bin
458477b2486f895a1eafaad5168e08f70641075c36326bb2744260396eb6f797		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10604 bytes

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