Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7162db4367f2e9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-21 12:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fbfecc8be6873053e828a282decdc4b SHA-1: 5e6effe348c0acbe875f0bf33e3dfecdfa2f990b SHA-256: 5c7162db4367f2e95d434986e07bb9196eb0e9720f37ecfd6967e2f0c0ee5d50
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, https://ttraff.ru/pify?keyword=zojirushi+bread+machine+manual+bbcc-+x20, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating an attempt to direct users to malicious or spam content under the guise of providing a manual.

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=zojirushi+bread+machine+manual+bbcc-+x20
    • http://sefopibos.chinookwritingandjournaling.com/uploads/1/3/2/7/132740900/rapumegaka-nuxix-kusizetabajug-lopudoku.pdf
    • http://files.fionahill.net/uploads/1/3/1/4/131437584/wufaro-fexodato-kowivukine.pdf
    • http://files.emeraldbeachpizzapasta.com.au/uploads/1/3/0/9/130969358/6448757.pdf
    • http://files.pursanovaaz.com/uploads/1/3/1/1/131164130/4585743.pdf
    • http://files.emergingpaintinginvitational.com/uploads/1/3/1/4/131407035/3041218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/govamafexatotelija.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45560821546.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/built_in_functions_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/padman_movie_in_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/bedubefepizutob.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/sevajejitipej.pdf
    • https://cdn.shopify.com/s/files/1/0436/5526/6457/files/3rd_grade_common_core_math_assessments.pdf
    • https://cdn.shopify.com/s/files/1/0430/0711/5423/files/77207991592.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0428/8253/1491/files/312794022.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/kusowadegexazexefufelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/25765948919.pdf
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/21654897657.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_off0000681f.bin
e3382c550e6391248cc126a0ae206acbd4167c28ec35cdda31ada0b98ad54cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681F 5728 bytes
font_01_sfnt_off00007b80.bin
833722f3a2b7f0e411e57f2d24515e7c1e67b7feba71ea93c577e399cc68f0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B80 10136 bytes

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