Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb5888de71e0633…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 05:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e318ebae8710474272953b31a4242b21 SHA-1: 73fe9100622332014143d3c27fcbcc78e5536c43 SHA-256: dfb5888de71e0633e51aa0302bc7a047bc432cf8789c532d8505a4f255cd5fa7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=afrofuturism+ytasha+womack+pdf'. This URL is embedded within the document body, suggesting a social engineering lure to trick users into clicking the link. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to potentially improve search engine ranking or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=afrofuturism+ytasha+womack+pdf
    • http://files.flushingpres.org/uploads/1/3/1/1/131164295/givezapukajewi_jekugavevag.pdf
    • http://files.stephenhallmarimba.com/uploads/1/3/1/1/131163533/jufoga-jizul.pdf
    • http://files.myheart-myhome.com/uploads/1/3/1/3/131383398/2349459.pdf
    • http://files.littlesoulyoga.com/uploads/1/3/1/8/131856039/22085885a0.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9950/files/toridumoxafiba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6732/files/asking_the_right_questions_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bamizubonofosexewa.pdf
    • https://cdn.shopify.com/s/files/1/0449/2250/3323/files/livro_abordagem_centrada_na_pessoa_wood.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/37036367423.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/plural_of_memorandum.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/legubizemoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/xafutonew.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/kadizurunigomikoxiw.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/
    • https://cdn.shopify.com/s/files/1/0430/77

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd8.bin
1e749aed7ba226ac7693578a48e9ae167474fbbb4436757ed45928763777d772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD8 5612 bytes
font_01_sfnt_off00007fe2.bin
4469a6624d9254018554cd9ace7e8c65f0af797adca915ed72be36e3e0bd1d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE2 10004 bytes

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