Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b66bbe3a3162c9e…

MALICIOUS

PDF

47.1 KB Created: 2020-08-20 23:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a553fa41e15de9526ff11f3addd5ad8e SHA-1: 50f48706bc76aa352f4d8a31d92fb99f074fc775 SHA-256: 0b66bbe3a3162c9e4748c6a2b1e6c82963ab8601b75270fce8798a229f677430
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, "https://ttraff.ru/pify?keyword=gemsy+industrial+sewing+machine+manual", is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same sewing machine manual and the malicious URL, indicating an attempt to lure users to malicious infrastructure.

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=gemsy+industrial+sewing+machine+manual
    • http://files.sassysproutnutrition.com/uploads/1/3/2/6/132695273/be3310.pdf
    • http://kadodevi.adelantechc.org/uploads/1/3/2/6/132682878/siwiruba-lebuduj-bunibuzowiwo-vofuxa.pdf
    • http://files.k4amg.org/uploads/1/3/1/3/131384024/20d7d2d136.pdf
    • http://bazos.hinzmanushistory.com/uploads/1/3/2/7/132740541/sutafazepis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/16517467556.pdf
    • https://cdn.shopify.com/s/files/1/0433/7781/9802/files/67742383496.pdf
    • https://cdn.shopify.com/s/files/1/0429/9158/3391/files/discworld_collection.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/adobe_scanner_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/the_systematic_design_of_instruction.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/52983573214.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/fidoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/mokekotorodaduzizugukofe.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/labofamupufubigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/tutifuveribetenezevexugej.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/21342733626.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_off00007867.bin
525526789c701171a3556bc61219d8b6ef53b66855417d42cae4f94510c555b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7867 5576 bytes
font_01_sfnt_off00008b45.bin
a3a582c20c2f3037010a678141e492a88ca46db50bec419b8dc20b8e57514c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B45 10732 bytes

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