Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e6720ef82d67fe…

MALICIOUS

PDF

54.6 KB Created: 2020-08-29 13:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05968c5758a5eef8c841cedaa2f32153 SHA-1: b52685c29603d04772128434affa83c81d7901ee SHA-256: 78e6720ef82d67fe36c0d5b34c9df6a9cba35429536d89154ba8afb3411e5457
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=invention+skill+guide', is flagged as a malicious redirector. The document body and heuristics indicate a classic advance-fee fraud lure, likely attempting to trick the user into believing they have won a prize or are due a parcel, which requires payment. The presence of numerous external PDF links suggests a link farm used for SEO manipulation to distribute the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/wix?keyword=invention+skill+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nujogopuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/lomexobavuwisazawopapebox.pdf
    • https://cdn.shopify.com/s/files/1/0437/4917/9541/files/wofepi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/58521109476.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/ameristar_heat_pump_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/13513145938.pdf
    • https://cdn.shopify.com/s/files/1/0460/7043/1908/files/witaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/total_gym.pdf
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/kewediruvozepivujesos.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d5c156f420f4fbab58e508c15a4dbc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_561be93fb2bf4e8cae146a7f223480b2.pdf
    • https://cdn.shopify.com/s/files/1/0441/3105/7816/files/geography_hemispheres_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/chemistry_jamb_past_questions_and_answers_2018.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000995e.bin
70b4f75c164f96d4d3723bee814f227f67277a194b9e75ad75e12b83ed898721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x995E 4748 bytes
font_01_sfnt_off0000a9a1.bin
4a754f440f2c8ab8f6f66986c18f846f7fa6e58e1c537aa97194a3ce1deb218a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A1 10540 bytes

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