Malicious PDF — malware analysis report

Static analysis result for SHA-256 033dfb4d778450df…

MALICIOUS

PDF

74.7 KB Created: 2020-08-04 18:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1a58d7282dbfac35b8f47e76314a5b7 SHA-1: 3bb461902e7ff8a470e2ba1824d8e99bb9cdab63 SHA-256: 033dfb4d778450dfd46e747d5eca0a242b36c8ff22c8dda59ae6930bd9a27031
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'mastering blockchain' and a download lure, aligning with advance-fee scam heuristics and a secret recovery lure. The presence of numerous PDF links suggests an attempt to create a link farm for SEO manipulation, potentially to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=mastering+blockchain+2nd+edition+pdf+free+download
    • http://files.windsweptwillow.com/uploads/1/3/1/4/131453068/vozewu.pdf
    • http://files.incendiamotus.ca/uploads/1/3/1/4/131437149/bepij.pdf
    • http://files.getpacificapps.com/uploads/1/3/0/7/130739212/sezawupop-gifenu-dovijanup.pdf
    • http://kugavav.perthheart.com/uploads/1/3/1/0/131070722/xozileti-mukusixew-nuzalofizum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/52971057883.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/68151884447.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/jifuvex.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/77788767840.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/zukusinawigedokesat.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/nogebizefov.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/77502543533.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/rutikojubujed.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/fabekigetozewetimuwuke.pdf
    • https://cdn.shopify.com/s/files/1/0438/1805/7885/files/fapevejo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/71918212345.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_off0000d5d0.bin
4b13b779468ca9e062ba13aa159c3c5d04df1f15b952e1bbcdcadf1a823d94f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 5852 bytes
font_01_sfnt_off0000e9d0.bin
2f5bd1ff0ebb9c31b74a376bd7c5234eb26cc206b769b10a8b3422c6cd4b62af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 17068 bytes

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