Malicious PDF — malware analysis report

Static analysis result for SHA-256 619ac593318a5e08…

MALICIOUS

PDF

110.5 KB Created: 2020-08-04 09:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9562d089228342eb61a55481a048a11b SHA-1: 70c83fd59062b1ae8cf657aa06366c4f56662118 SHA-256: 619ac593318a5e08b0b9752c9d7a5cc43a8d63f3bf46836492622d005c20c4da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=bls+2020+pdf+espa%25C3%25B1ol+gratis'. The document body, though heavily obfuscated, contains text that appears to be a lure for this URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the PDF structure and malicious URL indicate a phishing or redirection attack.

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.com/pify?keyword=bls+2020+pdf+espa%25C3%25B1ol+gratis
    • http://files.joyfulsoundchoir.org/uploads/1/3/0/7/130738769/9229011.pdf
    • http://files.bistrollinc.com/uploads/1/3/1/0/131070561/rupiw.pdf
    • http://files.iammengdiwang.com/uploads/1/3/2/6/132695301/4f351b66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/76675772441.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/nurajiduxunitijazuda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevadijuxirefasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/44924784941.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/buwimutepigezawapofokalib.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/patuninopilifavedori.pdf
    • https://cdn.shopify.com/s/files/1/0429/2660/4447/files/16809851912.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/woods_rm59_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2093/files/18660199832.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/35927728175.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/55744061174.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://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fea.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEA 6744 bytes
font_01_sfnt_off000170cf.bin
5f54173d105b94a95fb980bf6ad787ef900206c6338ee4883f300f5bb75638aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170CF 5744 bytes
font_02_sfnt_off0001842f.bin
ff54ef4a0fdfd6ea021cde4b844612affbeaeb1fa0eee1e9705dcdaef1b86c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1842F 11520 bytes

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