Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2b6690b8bec4ca…

MALICIOUS

PDF

56.0 KB Created: 2020-08-07 07:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b858caba6068d5621b52c56eb9f102 SHA-1: 6cd3c42e8823ba25f65df4067d9a447f059e34e5 SHA-256: 6b2b6690b8bec4ca4a376841e48c9eaffa39f0369965f32ece0127f6b4fde550
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to what appears to be a link farm designed to host SEO-optimized PDF files. One of the primary links directs to a known malicious redirector, suggesting an attempt to lure users into a scam. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's purpose is to trick users into paying fees for non-existent prizes or parcels.

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.cc/pify?keyword=niit+core+java+book+pdf
    • http://files.beautifulweddingsbyina.com/uploads/1/3/1/1/131163667/d08ad.pdf
    • http://files.swiftcreekguitars.com/uploads/1/3/1/6/131607237/1680852.pdf
    • http://files.greetingcardsatjeffersongalleries.com/uploads/1/3/0/7/130739773/mavuxon.pdf
    • http://duvuvuze.apwindowsuk.co.uk/uploads/1/3/0/7/130776487/5813463.pdf
    • http://files.midatlanticbrassbandfestival.com/uploads/1/3/1/3/131384589/7639131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/6754/6527/files/50625298694.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/rationale_zahlen_klasse_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/73022890643.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/study_guide_for_brave_heart.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/57661303480.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/gateway_services_webpayment.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/78850122435.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/exerccios_lcoois.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/besoin_de_fond_de_roulement.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/90459329591.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/kakulotawerolobilixulixo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/download_kosakata_bahasa_arab_sehari_hari.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083d5.bin
d8ca0b2822754e527be48bfe4142012d001ce1148c460957bbb275db63b698a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D5 4928 bytes
font_01_sfnt_off000094b1.bin
c915d59311c5d2a335ac17a5998f327417811c9eb804d29450f777b880c3c4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B1 15088 bytes
font_02_sfnt_off0000c44d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 4324 bytes

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