Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49ee54f0146882d…

MALICIOUS

PDF

40.3 KB Created: 2020-08-13 21:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e221018931816dc26bc7e90826313ca8 SHA-1: 28c4595b79f14820de02abc6aafe3a24b85e9aac SHA-256: c49ee54f0146882de910872a9515a51836dd69bb81bfbb443070e1924cfa6f92
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'https://ttraff.cc/pify?keyword=constitution+day+worksheet+pdf'. This indicates a likely attempt to lure users to malicious infrastructure under the guise of a worksheet. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=constitution+day+worksheet+pdf
    • http://files.gbicommunitygallery.org/uploads/1/3/1/3/131379312/dixogefalu-xoxuketef-gejovedopa.pdf
    • http://files.limaresources.com/uploads/1/3/1/0/131071289/butanixopu_rowuxuzageti_danuduru.pdf
    • http://narawi.mackprichard.com/uploads/1/3/2/8/132814930/burazebiv-jepowurovisizub-pikobopalo-bewegepawojado.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/91945496626.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/a_guide_to_sql.pdf
    • https://cdn.shopify.com/s/files/1/0447/0797/1226/files/mowedot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/51816420502.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/remerol.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9511/files/anxiety_disorder.pdf
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/risuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4792/files/catalogo_natura_ciclo_9_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/273773342.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/difidudexujoteb.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/42114282737.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/zixurogaxisenepikupafexog.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_off00005e9b.bin
21d2cda51fa249c2bc35e35b679558e313183d958eb44aa214760f08458b3089
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5260 bytes
font_01_sfnt_off0000708c.bin
4c1e42f31879ae7f7e74fb563b8be792880a173de50d2be625fa1a2490360e10
pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 10548 bytes