Malicious PDF — malware analysis report

Static analysis result for SHA-256 a638cff7c6d23a48…

MALICIOUS

PDF

48.6 KB Created: 2020-08-10 01:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc4633f5a993b1f1970bd497e6fe520c SHA-1: ea8619c990b40ee463c5fadacb61c6c16c8a6042 SHA-256: a638cff7c6d23a48718a83b913ac841038fb420b9f954ac1acf2f626cd067f75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits malicious characteristics, primarily through its extensive use of embedded links. A critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=andrea+andrassy+dnevnik+gradske+cure+pdf'. Additionally, the file contains a large number of external PDF links, many hosted on Shopify domains, suggesting a potential SEO manipulation or link farm tactic. The ML classifier strongly supports the malicious verdict.

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=andrea+andrassy+dnevnik+gradske+cure+pdf
    • http://potijoza.cisddashboards.com/uploads/1/3/0/8/130814328/d43e70a793.pdf
    • http://files.easel-lab-mondal.com/uploads/1/3/1/3/131378780/6618228.pdf
    • http://files.kickkim.com/uploads/1/3/1/3/131384136/8b45e45e.pdf
    • http://files.bestoftimeswatch.com/uploads/1/3/1/3/131379749/e4facd24be.pdf
    • http://files.siennapagett.com/uploads/1/3/0/7/130776590/vimasadula-kuzatofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/74856068721.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/libros_de_autoestima_en_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4235/files/yasin_sura_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3920/files/maxawudunux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/58547965510.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1588/files/87466449797.pdf
    • https://cdn.shopify.com/s/files/1/0428/5100/8671/files/8862413106.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/zidates.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/lowes_ogdensburg_ny.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/91143052602.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/complete_pet_student_s_book_vk.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/11199966534.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/18073911477.pdf
    • https://cdn.shopify.com/s/files/1/0438/1461/7245/files/33502508495.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f3b.bin
18d6cc3e744c2cb7069cd106388e798ab4aee6c5010275372c718a311737b288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3B 5504 bytes
font_01_sfnt_off00009220.bin
6a1719a153066d5dacb12a49027e010b5e6a482e472fd410b00df45c0219c9ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9220 10220 bytes

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