Malicious PDF — malware analysis report

Static analysis result for SHA-256 5683b487c95f92bf…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 05:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2e6151d2e3c1e8f0224dc015354dbd SHA-1: 5469ace76084d70f77685c523ef8c214cd629304 SHA-256: 5683b487c95f92bfa142eba7fe466d79a70a72ee5eeae1be91a96e26067abcfd
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=definition+of+human+development+pdf', suggesting a lure related to the topic of human development. The presence of a large number of external PDF links, many hosted on Shopify, further supports the idea of a link farm designed to obscure the malicious redirector.

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=definition+of+human+development+pdf
    • http://files.craftacrosstime.com/uploads/1/3/2/7/132710679/kunewenowamixadaw.pdf
    • http://files.hanakahn.com/uploads/1/3/2/6/132682040/5072851.pdf
    • http://vimexi.lifesgeneralist.com/uploads/1/3/2/8/132816066/6744223.pdf
    • http://files.allhottub.com/uploads/1/3/0/7/130738821/kojasoreb.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/75377844734.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/jujugoxomikudub.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/difference_between_mitosis_and_meiosis_table.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/54297556148.pdf
    • https://cdn.shopify.com/s/files/1/0447/7383/4901/files/6841342721.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/fodoxebuzawufusalor.pdf
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/tutorial_de_excel_avanzado_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/soguvif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/wufikuxexabup.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/katoziko.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/70207143434.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6518/files/88699239137.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006305.bin
db4fd63fbf643939b9a920adea7bd2f8fbbaa00c04ac405c6ce9c3ba478c5ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6305 4948 bytes
font_01_sfnt_off000073bc.bin
d89f829a8eb391281adc6473218da12d53393cb669e018fb70e6045c1d812802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BC 10092 bytes
font_02_sfnt_off00009633.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9633 4324 bytes

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